Ok I ordered an Ed Brown SS hardcore stop, Wislon SS bullet proof stop, and the STI stop.
The Ed brown says its for a series 70 but is cut for a series 80.
The Wilson dropped right in the slide, the only fitting was to file the top for the bomar rear sight. A little loose for me but worked.
The STI alhough blue was oversize from side to side and front to back. Already cut for the bomar sight, all I had to do was fit it for front to back and side to side.
Being this was my first firing pin stop fitting I was happy with the outcome. I will use the STI and keep the Wilson for a spare.