Mid eighties Dodge Ram truck and van platforms with air conditioning. Late seventies and eighties police cars. All the ChryCo overdrive fan pulleys are short and need a piece of 3-1/4 inch I.d. DOM tubing ( drive shaft type tubing) or a long snout off of a standard pulley added into the center hub. I would suggest keeping an eye toward CVS site as well, being that they do make v belt pulleys as well. My lower pulley is a 400 truck engine a/c pulley with eight inch double rear a/c drive and a 7-1/2 inch front pulley. I used a 5-1/4 double groove pump/fan pulley and welded in a piece of 3-1/4 i.d. 1/16 wall DOM tube to make it long enough to run off of the eight inch drive sheaves, the front 7-1/2 inch pulley is unused.
