You've probably figured this out already, but you don't need to remove the motor mount. The two rear bolts on the compressor grab an aluminum block that's threaded for the bolts. As the bolts are tightened, the block is pulled against a pair of bosses the bolts pass through and that sandwich between the block and bosses on the compressor, and the compressor is thus held in place. Once the front bolts are removed, loosen the rear bolts and the compressor will start to move toward the front of the engine. Once the bolts are completely loosened (you won't be able to remove them unless you remove the motor mount, so this is where the idea of having to remove the mount comes in, but you don't need to anyway, they just have to be completely loosened), push the compressor forward, then maneuver the threaded block out of the way and the compressor will pull free. The bolts will get in the way a bit, but it'll all come apart. Note the orientation of the block, it only goes in one way. Hope that helps.

Richard in Kansas