I am rebuilding my 1981 V4 140 Evinrude and would like to replace all crankshaft bearings. My local shop has told me that Bombardiar only supply the upper crankhead bearing in an assembly (with housing). I am wondering why I cannot just replace the bearings and seals (and save about $300)? The only thing I can think of is perhaps there is an alignment issue hence the lack of bearing only option from Bombardier. Any advise would be appreciated.