hey there... what do you mean by "any compatibilities for this 1st gen CRX ?" are you going to attempt a 6 puck for an accord in this rex? i own an 87 rex and did swap the clutch. the job is easy, just a lot of work. if you work slow, your project will not be completed for a while; if you work fast, you can finish in a day. on an 87 rex, the only thing that is a prob is remembering where the millions (figure of speach, and for a carb'd motor) of vaccum hoses go after you pull the motor out. if you leave the motor in the car and drop the trannie, the only major issue that may give you a hard time if your by yourself is re aligning the tranz to the block. I suggest you get an extra pair of hands for that matter. as a suggestion, crack the wheel knuckle hub nuts while the car is on the ground (that should be the first thing you do, then start jacking it up). that crx is light, i acutally shifted it off the jack stands once while trying cracking those. let me know what ever questions you have and i'll answer. what motor is in that rex? d15a2, a3?