Advice needed: Slide mount on the 1911 Sig Sauer

I have a Sig 1911 XO and would like to install a slide mount for a red dot. I read that the top of the Sig slide is different from standard 1911. This is the only 1911 I have, so no base for a comparison.
If anyone knows which slide mount would fit a Sig 1911, I would be greatful for the information. Otherwise, my only option is either a grip mount (which I have now) or a frame mount.

Regards,
Oleg.

Just give Marvel Custom Guns a call.  They should be able to answer the question.  Looking at the photos, their slide mount should work, but they would know.
410-557-6545

Oleg, if no one has a satisfactory response sooner, I will check in a couple of days.  I have some spare RRA slide mounts and even a Weigand frame mount and my shooting buddy has a SIG Super Target.  I can check the fit and see what is up.  Thursday night at the latest, but probably tomorrow if I can make it to the range (he works there).

Looking at the pics of an XO, it doesn't look too off, maybe the top radius is different.

Thanks, willnewton, the top radius is the main difference, I think.

Regards,
Oleg.

Do you have a Sig Traditional 1911 or one with the modified radius?

It's this one. I believe that it has the modified radius.