We offer a very select crankshaft options, mainly aimed at performance crankshaft micro polishing and balancing.   We do offer our very own crankshaft kits and generally do an exchange.  This is all done though our parts affiliate www.ONFPJ.com.  They stock our crankshafts in kit form, and we process crankshafts soley for them.    However, we will clean, measure, crack detect,  and micro polish used crankshafts for standard size journal builds.