Jeff, I had seen in a issue of WOOD magazine what you are looking for. I purchased a couple of sash kits last year. Crestline Windows & Doors sell the kits. I sent for information by calling them at (715)845-1161 or you can write them at
Crestline P.O. Box 8007 Wausau, WI. 54402-8007
P.S. They will send you a list of Crestline dealers in your area to order.