The truth is, that like the 1948 Tucker, the missing molds were bought by shill bidders from AMT & Revell.
Then they were hidden at a ranch in Roswell, NM & later went to a storage hanger at Area 51 where they remain till this very day.....
Rob, I am kit bashing my Olds with an AMT 51 Chevy Crusin' USA...& an AMT 69 442..the wheel base on both is different from the 50 Olds. I may just use parts from each to update the drivetrain...Al