First of all your 66 must have a boss for a motor or handcranks. If it truly is a 49 it will probably have one.
( pic)[ATTACH=CONFIG]593046[/ATTACH]
if it is not a spoked handwheel you will need one of those.
The handcrank will attach with a screw and washer to a tongue and groove slot with a hole through it.
Some handwheels have different depths on the center hubs, so that can be an issue..