My Parts book is from 1949 and it doesnt have the details about spline shoulder length or thread lengths. thanks for providing that.
I measured
my small one is 1-3/4" long, 7/16" long splined shoulder, 1-5/16" long bolt threads so mine are 3683850
my large ones are 3682387
since I cant use the large ones, if anybody wants em, let me know. its a full set of 10 with the cool nuts with integrated washers. NOS.
