Follows are the dimensions of rear shackle bolt, as requested by Phil.
It's hard to hold caliper still while taking photo with other hand, so I have taken the measurement first, then tried to hold in the representative position......or close enough to know what the measurement refers to.........I hope.
Length.
O.D.
Distance of groove bed start from end of bolt.
Distance of groove bed end from end of bolt.
Groove total width.
Depth of the pin groove is 0.1185" below surface of the bolt, give or take a couple of thou.
Total width of the bevelled surface each side of the flat groove is 0.075"
Don't ask what the angle of groove bevel is, it's not 45 degree, but cannot find anything precise enough to measure accurately, and I am not learned in the ways of the force!