Look at mine and other's posts about the available rear heads. One guy installed one that let him use the factory hoses. I have a head that I think will work (with Rollguy's kit), but still waiting for my son to return that car. Of course the heads are different for SD5 and SD7 compressors (5 vs 6 bolts). I suggest a Sanden "shortie", i.e. the "13". That will give you ~1.5" less depth so easier to fit the hoses without bumping into the motor mount. I will be visiting my son next week, but am not going to try swapping compressors in a motel parking lot, though I will replace glow plugs and such. If worried about cooling capacity, don't use R-134A. I will use Duracool. A parallel flow condenser would help too.