I checked my stock this morning and dug out the ones I remember using. The difference is on the outside measurement, not the inside. If you go to your local parts store armed with these numbers, they should be able to cross at least one of them. If not, go to a different parts store.

Anchor Doan 2267
G.M. 3904080
Westar EM2267
Balkamp 602-1106
Borg Warner 31-2267
Sealed Power 270-2267
TRW 82267

This mount has the safety bracket built in. I hope this helps.