Need Help Looking for a Bit

I need help locating this bit. I have been searching eBay and the bits stores, but have had no luck at all. I believe this is a spotlight from the vehicle upgrade sprue one version prior to the current one.

Space Marine/Imperial Guard  Spotlight/Searchlight
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I am willing to trade or buy (I only need 1). Can anyone out there help me?

List Building: Imperial Guard

I have always wanted to make a rag-tag, or eclectic looking IG army. I was never sure quite how to do it (or when I would so), but I have been collecting the models for 15+ years. As evidence, here are a few pics...

The root of the inspiration is the last ditch effort to defend an outpost or some other important location. I envision the force to be comprised of the local enforcers/arbites, remnants of planetary reserves, desperados,  prisoners, conscripts, special forces, kill teams, and elements of the local administratum. Because of our Dark Heresy campaign, I only recently thought about including an inquisitor and/or rogue trader-- either a counts-as company command squad, or an additional inquisitor ally squad.

This is not meant to be any sort of competitive tournament list, just a casual fun list. Except for the 2 chimeras, I have everything listed. The Arvus Lighter is a scratch build project, primarily for use in Dark Heresy.

3000 Pts - Imperial Guard Roster

HQ: Company Command Squad (11#, 375 pts)
Rogue Trader or Inquisitor?

• 4 Company Command Squad (Carapace Armour; Krak Grenades; Medi-pack; Regimental Standard; Vox Caster; Plasmagun x1)
• 1 Company Commander (Melta Bombs, Power Fist; Plasma Pistol)
• 1 Astropath
• 2 Bodyguard
• 1 Master of Ordnance
• 1 Officer of the Fleet
• 1 Chimera (Turret Heavy Bolter; Dozer Blade; Hunter Killer Missile; Pintle Storm Bolter)

: Ministorum Priest (1#, 60 pts)

• 1 Ministorum Priest (Eviscerator)

: Techpriest Enginseer (2#, 95 pts)

• 1 Techpriest Enginsee
• 1 Servitor Unit (Plasma Cannon x1)

Elite: Kasrkin Squad (11#, 260 pts)
Special Forces?

• 9 Storm Trooper Squad (Flamer x1; Grenade Launcher x1)
• 1 Storm Trooper Sergeant (Power Weapon)
• 1 Chimera (Turret Heavy Bolter; Dozer Blade; Pintle Storm Bolter)

Troops: Infantry Platoon (54#, 492 pts)
Planetary Reserves/Garrison

• 2 Platoon Command Squad (Vox Caster; Flamer x1) 
• 1 Heavy Weapons Team (Missile Launcher)
• 1 Platoon Commander (Power Weapon; Plasma Pistol)

• 7 Infantry Squad (Vox Caster; Meltagun x1)
• 1 Heavy Weapons Team (Heavy Bolter)
• 1 Sergeant (Bolt Pistol)
  
• 7 Infantry Squad (Vox Caster; Flamer x1)
• 1 Heavy Weapons Team (Lascannon) 
• 1 Sergean

• 3 Heavy Weapons Squad
  
• 3 Heavy Weapons Squad
  
• 3 Heavy Weapons Squad
  
• 20 Conscripts Squad

Troops: Cadian Squad (10#, 135 pts)

•  9 Veteran Squad (Demolition Charge; Melta Bombs; Vox Caster; Meltagun x3)
• 1 Veteran Sergeant (Melta Bombs)

Troops:  Gaunt's Ghost Squad (10#, 142 pts)

•  9 Veteran Squad (Camo Cloak; Snare Mines; Vox Caster; Plasmagun x1; Sniper Rifle x2)
• 1 Veteran Sergeant (Camo Cloak; Snare Mines; Bolt Pistol; Power Weapon)

Troops: Penal Legion Squad (10#, 80 pts)

•  9 Penal Legion Squad
• 1 Penal Custodian

Troops: Adeptus Arbites Squad [WH] (7#, 152 pts)
Local Law Enforcement

• 5 Adeptus Arbites Squad [WH] (Flamer x1)
• 1 Veteran Arbite [WH] (Auspex)  
• 1 Rhino [WH] (Pintle-mounted Storm Bolter; Searchlight)

Troops: Adeptus Arbites Squad [WH] (7#, 165 pts)
Local Law Enforcement

• 5 Adeptus Arbites Squad [WH] (Grenade Launcher x1)
• 1 Veteran Arbite [WH] (Brazier of Holy Fire x1; Auspex)
• 1 Rhino [WH] (Pintle-mounted Storm Bolter; Searchlight)

Fast Attack: Armoured Sentinel Squadron (3#, 255 pts)

• 1 Armoured Sentinel (Lascannon)
• 1 Armoured Sentinel (Lascannon)
• 1 Armoured Sentinel (Lascannon)

Fast Attack: Rough Rider Squad (5#, 90 pts)
Desperados

•  4 Rough Rider Squad (Meltagun x2)
• 1 Rough Rider Sergeant (Melta Bombs; Plasma Pistol)

Heavy Support: Leman Russ Squadron (3#, 570 pts)

• 1 Leman Russ Battle Tank (Heavy Bolter Sponsons x2; Dozer Blade; Pintle Storm Bolter) 
• 1 Leman Russ Battle Tank (Heavy Bolter Sponsons x2; Dozer Blade; Pintle Storm Bolter) 
• 1 Leman Russ Battle Tank (Heavy Bolter Sponsons x2; Dozer Blade; Pintle Storm Bolter) 

Heavy Support: Arvus Lighter (IA) (1#, 105 pts)

• 1 Arvus Lighter (IA) (Armoured Cockpit; Flare / Chaff Launcher)

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Arbites (counts-as) Rhino WiP (part 2)

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I got a little bit of time in on my Adeptus Arbites (counts-as) Rhinos. I added the remaining bitz to the prototype, and was able to complete the the other 2 vehicles as well. It was surprising how much time I spent planning and experimenting during this project. This isn't the first time I used poster tack to temporarily hold parts/models together, but it is to the extent used here.

I decided to trim down the smoke launcher tubes--
a little more than half
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Side-by-side comparison to a mk1 Rhino
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Hopefully I'll have all three painted up later this week.

To see the development of this project check out:
Arbites (counts-as) Rhino WiP
Adeptus Arbites