Renew as many components that make up the crankshaft/con-rod/piston assembly as you can, including amongst others; bearings, bolts, con-rod, piston, piston rings, piston Pin and the piston Pin retention circlips 0938120004 - all pretty much essential when rebuilding the engine.
Interfacing new parts with old may cause the new parts to wear prematurely (or even fail!) and lead to a less than satisfactory outcome.
This component and perhaps quite a few of the parts listed below maybe required for a full crankshaft/piston assembly rebuild: