the real Art Carr # on the 9" non lock is a 19930. That 16930 is the old # that Art used at his old place. If you decide to buy new, besure you use the Art Carr in California not Texas or Reno. His # Is 1-877-278-2277.
The new place is California Performance Transmission. The 16930 does not have the billet front cover,where the 19930 does.
HTH
Puddin