help with rare dovetail/bracket for SW AZ3 mount

I recently bought from a friend, a SW Mak127 with an EQ3 mount and Vixen type dovetail. Since I wanted a lighter mount, I sold the EQ3 and bought the SW AZ3 alt/azimuth mount for the Mak127. But I encountered a problem:

The Vixen type of dovetail does not match the AZ3 mount head. Ther friend who sold me the mount has the same Mak127 on the same AZ3. But he has the scope attached to the AZ3 mount with a different kind of Dovetail or Bracket. He lent it to me and I tried it on and it works. Well after I drilled 2 holes wider on the mount head to match the 2 holes on this rare dovetail/bracket. My friend of course needs this dovetail/bracket back otherwise he can't use his scope and he doesn't remember where he got it. He said it might be an OTA Bracket. So I'm posting some pictures of the dovetail/bracket, the Mak125 and the AZ3 mount... and I'm asking for help. Anyone knows what model this is and where to buy it?

Thanks.

All I see are ads.

John