engine driven compressor help explorer/ranger

hey i really need some help with this. i have a 91 explorer and want to run an engine driven compressor. same deal as a ranger with a 4.0 i really need to figure this out soon ive been researching for about a couple weeks and cannot find much. i know i want to run a york 210 but where can i get a serp clutch besides onboardair.com does anybody know what kind of car they came off of and where i can get 1 cheep? if i can find out what car they came off of i can get it cheeper at a parts store cause i get discounts. and my other option is runnin a v belt but how would i hook it up to another pully is there any combo pullys out there i would be able to use. and welding 2 pullys together is not an option. also any other extra information about these compressors is greatly welcome. and if you have pics please post thanks alot everybody