Try thease vatos thear the ones that did my set up about 1 1/2 years ago and I know that they have done a couple of Imps. and they also carry the engine driven comp. That is the best way to go with if it fits your car its a lil more expensive but well worth it, reson being is that you cant hear the comp. whean it come on and your tank fills alot quicker.
They are located in El Paso Tx (my town) but they can help you, with the parts and give you good advice, talk to Alex he will help you tell him that Freddy the owner of the lowlow(buick regal) referd you to them.
this is thear web page.
http://maverickkustoms.com/