Hey guys, just wanted to chime in on this topic. I pulled the stock compressor, stock condenser, accumulator and hoses and ended up doing one of those classic auto air upgrade kits with a Sanden compressor, brackets, hoses, accumulator, etc. It didn't come with a parallel flow condenser, so i ended up finding a generic condenser with similar dimensions to the stock one, fabbed some brackets and put it all together. I also added a pusher fan on the condenser to help cool things when the truck isn't moving. The truck cools pretty nicely on 80+ degree days. But when standing still, you can tell that the AC isn't as cold, but still plenty cool. A lot of people just kinda say that the R134 doesn't seem to cool as great as the old R12. But, with vent temps at 45-degrees on a hot day, i can't complain. The point of my rambling is, if you're mechanically inclined, and owning a K5 I assume you are, buying a generic parallel flow condenser will work just fine and help you achieve better results with R134.