The Spegel grips sold by Butler Creek and Uncle Mike's were thinner 5906 rubber grips compared to Hogue and Pachmayr.
http://smith-wessonforum.com/smith-...d-generation-grips.html?352679=#post137648288
Here is a picture of my PPC-9 wearing the Farrar grip:That thread also mentions “Farrar” grips. Hmm..
I have a set of these and used them for a while. Mine fit a 439/639 hybrid.