While looking for correct grips for a pre model 19 I found some appropriate design diamond target grips from a 4 screw model 53 .22 Jet magnum. The seller says they are K frame grips but I just read something about them being a "KTC Frame". I've already bought grips that were mislabeled, mismatched or just don't fit properly so since this is starting to cost a fortune I'd like to verify the correct frame designation for the model 53.

Appreciate any info.