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

I think there is two different 8 1/4 rear ends (Late modle/ early model) but is there two different sizes of pinion seals on these rear ends ?
I need to order my bearings and seals and just need to make sure :coffee2:
I could just remove the outer seals and bearings and have them matched, but I would like to make sure what year model this rear end is if I could with some ones help :color:

Thank you for your time on this :glasses7:

I was told it was a 73 duster rear end, just want and expert tech to make sure :coffee2: