they also came in the uk rover, for a hf crx you would need engine and ecu (if u want to use ur existing tranny axles hubs... which i dont suggest cuz itll be really weak but cheap). for the dx u need the same and a dpfi-mpfi swap in addition to engine ecu. for si you just need engine and ecu. the prefered swap is to use the zc tranny with the engine. so engine tranny ecu and acura integra 90-91 non abs axles with a zc intermediary shaft. if ur swapping into an hf then u need to swap out the nuckles and hubs in order to receive the integra axles with crx dx si or civic dx ex or si hubs. if that doesnt make sense let me know what car uve got and ill explain more