Did a little digging, the pin is 0.060 diameter, 1.33 in long and the spacing under the pad is 0.040 in. Pretty sure I cut them out of 1.5 stock. The length is best cut a little long and tweaked in rather than cutting to length the first time. The length is not super critical but it's a lot easier to take a little off than to add it back.
And a little more, the pin pad has a straight hole and DOES NOT accept a pin with a head on it so you need the correct style pin pad.
And a little more, the pin pad has a straight hole and DOES NOT accept a pin with a head on it so you need the correct style pin pad.