MAP cycles sells this double lipped crank seal. Spring in and keeps the ATF out.

These are the gallery of pictures. Click one. At the bottom of the pics will be a menu to bring you back here or go to the Homepage. Later in a restoration they will be worthwhile. The last picture on the first row shows the spacer to use when checking end float. See Timing Side link for write up. Arbor shims help with end float. Buy from McMaster-Carr.