Yes, as long as the alternator is physically compatible with whatever bracket you're using and the pulley you select (a) takes the right width of V-belt, and (b) winds up aligned with the belt line of the other pulleys on the same belt.
No.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Yet again, thanks, Dan.

FYI- If anyone is shopping for JUST a V-belt pulley, the Mopar numbers for the v-belt pulley for a 1989 Diplomat are:

4094028 (2 groove, 90 amp), 4111768 (2 groove, 114 amp), 4106094 (single groove)