I had to buy a pack of 10, so I have 9 shims left that fit 10.25 & 10.5 Sterling differentials.
They are flat and light, so I can just stick it in an envelope USPS.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.