Hi Mark
The change wheels should be: 20, 24, 32, 36, 38, 40, 44, 48, 48, 52, 54, 56, 60, 80 (note the two 48 wheels).
There should 8 speed wheels from 25 to 75 rising by 5's. There should be two large knurled spacers secured by grub screws to hold two speed wheels onto each shaft
I have spreadsheets for imperial and metric threads which I can send you if you drop me a personal message (PM)
They are very nice machines
John