Late 31 rear axle cotter pin question

[reggiedog]

HI Guys
I have a question on the rear axle cotter pins as I have everything else I just need to know the size of the cotter pins the original sizes as it's a original rear axle, but I have to put the original cotter pins in the shaft of the axle after the bolt is torqued to 125 ft. lbs. and I don't have the right size cotter pins for the rear axle so can someone please tell me what size the original cotter pins were originally.
Reggiedog