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Those wheels are from an MRAP and have a 335mm bolt circle (see them here...), so not good for your M51.

You really don't have to remove that shaft unless the bearing is bad. Just pull that old oil seal out with the help of a pair of sheet metal screws.

No idea. The only thing special on these boots is the collar on one end, to hold it in the bore via the stock retaining cup.

It really shouldn't be able to move-in much past that 1st notch. Could it be that the retaining snap-ring #53 is missing? It goes in the groove, in the splined end of shaft #4 and stops the shift collar #38 before it bottoms out at the end of the splines, on shaft #4. Well, yes - if you mean...

Not difficult at all! Maybe read this old thread showing seal numbers. Also post #8 in that same thread. (much easier to change seals and dust boots with the shaft removed, of course.) The correct seal for the rear (aux.) output shaft would be Timken #254287 (1.25" hsg.bore; 7/8" shaft diam...

See below diagram.... Unscrewing 5 cap screws (#37) is all it takes to remove the whole rear auxiliary drive unit and take a look inside. It should come off easily; if not then the front nose of the output shaft (#40) could be stuck in the corresponding shaft assembly #4 and that would already...