The parts book shows part # is 07472. However, one of my older parts schematics/diagrams shows the part # 07003 for the model 19, '4 1/8" bbl'.
Smith & Wesson Center Pin S&W K-Frame Model 10 12 13 14 15 16 17 18 19
If the front leg is too short on the new pins you received, I would suggest contacting Jack First Gun Parts. There have been center pin changes, and the new ones have a shorter front leg. They may have some of the older, slightly longer ones in stock.