I use the Possum Hollow bore guides. You can get them from Midway USA. Here is the chart to see what is needed for Contender & Encore;
Bore guide list You can also get them direct from Possum Hollow. I have a few wildcats in the encore. I called them up and Erik the owner said sure I can make that. I had it about a week. Here is the link to thier web site.
Possum Hollow Products