I have used Pachmayr, Tyler and Mershon (sp?) grip adapters. My .02 is to get one from BK. Just google BK grip adapters. I have gotten rid of all the others and use his exclusively. I know I didn't answer your question, but wanted to put this out there. I do not have any affiliation with BK, other than the purchase of several his adapters.
I have used Pachmayr, Tyler and Mershon (sp?) grip adapters. My .02 is to get one from BK. Just google BK grip adapters. I have gotten rid of all the others and use his exclusively. I know I didn't answer your question, but wanted to put this out there. I do not have any affiliation with BK, other than the purchase of several his adapters.