The owner of the gun actually sourced two new pins from Numrich, though their website indicated that they were out of stock. The new pins were not dimensionally compatible with the gun. The new pins were 1.07 inches long, which was tolerably close to the length of the large pins on the drawing, as was the .133 inch diameter measurement of the striking part. the .109 collar measurement was right on the money according to the drawing. For those interested, we had to modify the new pins as follows in order for them to work with the subject gun.
The diameter of the striking part was reduced from .133 inches to .125 inches (would not pass through hole in bushing)
The length of the striking part had to be reduced from .300 inches to .255 inches or else it would project beyond the bushing with hammer cocked.
The length of the tail of the firing pin had to be reduced from .660 inches to .495 inches so that it would not project beyond the frame on the inside of the inletting and prevent full hammer travel.
The finished overall length was reduced from 1.07 inches to 0.860 inches