I need a compressed air tank! But which one!
 

I have:

- GM Factory Air Ride shocks NOS (if the bladders are still good, they tested OK on the bench)
- GM Factory under-hood air compressor
- GM Factory under dash air ride level controller
- GM original AIR gauge from a medium duty unit
- GM original medium duty truck air horn set (but it's pull-chain, I need a solenoid valve)

I'd like to them all together as an "air system" for my truck, including a reservoir. There was a factory optional tank available as an accessory but I've been watching almost 10 years and never found one, so "some other black air tank" will have to do.

Anyone have a recommendation for a small tank they know will fit and mount nicely underneath?

If you have other ideas how to make a 'factory air setup' more compelling let me know as well!

Thanks!