"gripper pattern" u bolt question

Both my 62 and 64 b-bodies with original 8 3/4 rears, 64 is an original 8 3/4 Sure-Grip, do not have the flat top knurl u-bolts.
When I rebuilt the 62 rear I put the flat u-bolts on it, fearing the worst.
Just redid the 64, couldn't find the flat top ones, bought them from Espos along with the springs, which are round like the originals.
Torqued to 45 ft/lbs was not much more than what I 'torqued' them to by hand with a small rachet.