I had previously id'd my rearend as an 8.25 as it has the 10 bolts on the cover and the LBP lugs. However, it has no fill plug in the rear cover , the fill plug is a threaded bolt in the housing (passenger side) up by the U-joint. Did they make different versions of the 8.25? Spring perches are at approx. 43" and both have a 5 x 4.5" BP. The casting numbers on the bottom of the housing read:

2852905
0825

So I'm pretty sure the 0825 identifies it as the 8.25 right? I'm asking because I need a new ring and pinion and want to make sure I'm getting the right thing.

Any ideas?