These three index wheels are 6" outside diameter, 1/8" thickness, with 1/4" center holes. The set sold on eBay (item 734776672) by towerclockman in November 2002 for $150.

PC 1-2: 120, 100, 96, 90, 84, 80, 78, 72, 64, 62
PC 1-3: 75, 88, 63, 70, 56, 59, 49, 54, 34, 41
PC 1-4: 144, 132, 118, 114, 112, 108, 98, 74, 70, 58