Differences in pulleys

[Mike Cobine]

Can someone tell me the differences in these pulleys?

Crank:
3791684 - not listed
3825433 - not listed
3744043 - dbl gr 6-5/8"
3858533 - dbl gr 6-5/8" '62-73 hp, s/hp, exc ac
3850838 - 7-21/64" w/ac, exc s/hp some years, s/hp other years, 64-70, grooves unknown

Water pump:
3790356 - ? gr, ? dia, normal match to 3744043
3770245 - dbl gr, 7-1/8"
3840463 - dbl gr, ? dia, current replacement is ??, normal match is ??

Thanks,
Mike