I'm getting ready to add onboard air and have been looking at the Onboardair.com site. I already have the York compressor but no brackets or clutch/pully. In the diagram for the mount kit it shows a double belt for the alt. and compressor which means that you need 3 belt grooves on the fan and crank pullies. My 304 has only 2 grooves on the fan and crank. It also looks like I will need a 2 groove pully for the p.s pump. My question is am I understanding this right and if so does anyone have the 3groove crank and fan pullies along with the 2 groove p.s. pump pully that they would like to part with? Any other suggestions would be welcomed.