they are part of the CL9000 kit, and for the donor I used one of the Western Star frames, although they recommend the FLD. (I believe it is so all the frame mounted resin parts will match to the proper frame holes.)
I couldn't wait....had to get started on it..........many of you know exactly what I'm talking about!!!!
Started with the engine....easy enuff...
on to the chassis and cab...........
and here's a shot with the engine in the frame
Take a look here........... http://sourkrautsmodeltrucks.com/?page_id=3 or here http://www.aitruckmodels.com/pages/kitsparts.html
I've ordered from both of these guys and I give them both thumbs up.
Bill -- the kit is pretty much box stock with the exception of the air ride and rims. The air ride I got from another builder and may not be correct for this truck, but that's what I had in the parts box. The rims came from the old Ertl Volvo kit.