Looking for a 3.89 or 3.54 diff . Please u2u me if you have anything

U2U incoming... https://www.locostbuilders.co.uk/forum/34/viewthread.php?tid=220415

I have a few 3.62 7” sierra diffs available

I have a standard Sierra diff with the pop in drive shafts with only 15k miles but not sure where to find the ratio...