Colt always use gold medallions on old generation Python. Gen 3 stock is what you needed.
Deer Hallow has all the information you needed to determine the right stocks of your Python. https://www.deerhollowonline.com/product/colt-python-early-3rd-generation-grips/
You need the Third Issue grips with Gold Colt medallions..........
Originals are expensive. An excellent option are exact replicas made by Deer Hollow. These are better then originals, and the price will usually be about the same as originals in good shape.
Eagle Grips Inc., is another great manufacturer of grips but can be pricey. Deer Hollow is another good makes. Also check ebay, as they from time to time have deals.