Amclean

So I put my gear box back in after a long time being out and noticed the release bearing, where it hooks onto the clutch fork, has a big crack in it. Also the clip that holds the bearing into the pressure plate is lost its tension. So I need to buy those. But I have a Nismo twin plate copper mix that I only put in and drove roughly 1000km on. My question is if I buy an OEM release bearing and retaining clip to secure it to the pressure plate. Will they fit the Nismo twin plate clutch I have in there? Also where would I get the retaining clip?

Thanks mate. Gonna send it and leave them out. Now I just gotta struggle the box back in. Hahaha

So I got the engine built by a shop to make sure it was done properly. And I am putting the engine back in and gearbox back in, then sending it back for a tune. All I have left is to fit the box, but the bottom four holes on the bell housing that meet up with the sump no longer line up because the brace the builder fit has pushed the sump down about 10mm. Do I have to get the bellhousing modified to fit?