The axles from the Gsr will not fit the hf spindles so your going to need to upgrade your brakes to dx SI or Da integra brakes. You will need a conversion harness that goes from the Gsr ecu to the main harness on the Crx if you don't have any experience with this I recommend getting in touch with someone reputable to wire it up. You will need a t bracket from a Da integra for the rear mount. Get hasport mounts and shift linkage. Change the timing belt and water pump while the engine is out of the car to save a little extra future work. I'm sure there's more but I'm in a hurry.