Can anyone here tell the year model (rear end) need new seals)

I'm no 8.25 expert for sure but think the early (up to about 75 or 76) used the smaller carrier bearings and maybe pinion bearings. I think the outer bearings/seals were the same for pretty much all 8.25s. FWIW I have a 73 8.25 that is stamped 73 on the case. Yours probably is stamped too. I'm doing the Jeep Grand Cherokee rear disc conversion on it which so far has been pretty easy.