this is for a b18c1..

alright i am changing my rings, i got them in the mail.. i didnt take my crank out, only the rods, and slipped my pistons through the top, already honed out the walls, but i know i need bearings right? those are the rod bearings, but someone also said imight need main bearings?? are those for the crank, cuz if so i don't need right? ne ways help is needed i wanna slap this biotch back together. and do u know a fast reliable site to order bearings off of? thx in advance.