I have a RUG E-2 tagged, C8AR main case toploader, and on the edge of the mounting flange above the drivers side top mounting bolt is stamped 8R170327. The 170327 are nicely lined up, evenly spaced and evenly stamped. Almost like some sort of tool or machine was used. The 8 and R are in line also but are more lightly stamped. Would this be 8 - 1968, R - San Jose, 170327 - consecutive vin. I thought manual transmissions were stamped on the bottom. Thanks. Brian