Hi Rvannen,
Ok, eh. I don't know much, but here's what i do know about hand controls. Saw the hand control car, and talked to the owner. The controls came from a Mobility supply store in Lubbock. I am thinking there should be one near you up there, and A Quality installer as well.
It is a single lever dual action control that attaches to the brake, and also the accelerator linkage. Push Pull for brake, lever down for gas, spring loaded return up to idle. it's tucked in there pretty smartly, any decent equipped mechanic can install the unit. They can be modified into other vehicles, and repaired. The unit is pretty substantial, not sure about cost. Hope this helps. Cheers!
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1990 Chevy G30 L19 7.4 EXT
Church Van, maternity division
DogVan
1988 Dodge B250
LA series 318 Wedge 5.2 TBI A500
Cabin Cruiser
'94 Dodge B350
www.xplorermotorhome.com/Xplorer MH model 230
230 hp LA series 360 Wedge MPI 5.9 A518 OD auto
Old vans are getting pricey!