I found this site a few days ago and I have an old VS-57 that has been converted over to gear drive instead of the ball drive. I recieved this supercharger about 15 years ago with a box of parts and some misc. mounts(Thunderbird mount and an old Kiaser mount). I decided to go through it to see what kinda shape it was in and thats when we found it was gear driven. Havnt mounted it on anything yet. From what I was told a gentelman used to use it on an old mustang back in the late 60's. Iam in the process of mounting it on a rat rod that I just built. Hopefully it will stay together.