arizonachoppers - since Ernie Ball didn't put these into production, there isn't much history on the old Leo-era Music Man guitars here at this site. I don't believe that EBMM has the old records; I'm pretty sure the bass info you are referring to was put together by players/collectors.
There is some good info on GGJaguar's site in the G&L Section (he collects G&Ls and Leo-era Music Man guitars): http://www.ggjaguar.com/gnl.htm