Guys,
I ordered a set of Round butt/Square butt conversion grips from The Hogue Auction site and I cannot get them to fit. I searched for some pics but did not find anything (I'm sure they're out there though) The gun is a 66-2 and there is a date of 5-82 date etched onto the grip frame. I thought that 66's were round butt, am I wrong? I appreciate the help, thank you.

Your 66-2 wpuld be a round butt, if it is 2 and a half inch barrel. If it's a 4 or 6 it's sguare butt.

Well, I answered my question. I went to the Hogue site and voila there is a pic. I feel real stupid. I spoke to a very nice lady (Roni) at Hogue and she is going to take care of it. Thanks guys and Thank You very much Roni and Hogue.

Hiram, thank you, It's definitely a sq butt. It's a 4" model too. I wish I had done a little more research.

The model 19 2.5" are also only round butt [same gun].