I'm going to convert my vacuum disconnect dana-30 in my '89 to a single piece shaft, like the later models. However.. Can I simply re-use the seals that are originally used on the '89? I've heard that you can buy an axle seal for a later model, grind down the surface and then install it, but I'd rather not take the carrier out. Is it possible to simply take out the two piece axle shaft, and insert the one piece without changing any seals whatsoever, or do they have different diameters?