I'd prefer this one to the convertible model. Still for what either cost it would be cheaper to buy an aftermarket kit. In reality back when there were real hotrodders and before 1-800 catalogs, picking up everything off cars in junk yards is the cheaper way to go. AC, like many other things, has us scared by those in the trade as too difficult for the home shadetree mechanic to do. From what I've heard many of those pro AC guys screw up too! Move that window unit to the rear window and save fuel.