71 pinion shims, no locating pins?

[jks67ss396]

Guys

I have shims to adjust my pinion angle. They are slotted on one side so they just slip over the ubolt instead of having to pull the ubolt out and thread the ubolt through

I have ECE trailing arms.

I have no locating pins on the 12bolt rear, and the ECE arms dont have anything to help locate the rear

The ubolts would normally be fine to locate everything together, but now, what holds these slip in shims?

To make matters worse, i have 2 shims on each side because the guy didnt have 4 deg shims in stock, so he sent me 2.5s and 1.5s.

Will the ubolt torqued up be enough to keep these shims from coming out?

maybe i need to make my own pins out of a cut down bolt? at least the shims wouldnt come out of the rear and the ubolts hold the rear to the arms

thoughts?

thanks!