Partzilla.com knows...
Grind down to the 1500 starter page, click on the part number,
and all the models it will fit will show up.
Valkyrie starters only fit Valkyries...
I had to get a starter once... starters never break (I broke mine,
it didn't break

) so I looked on Pinwall and found one
from a relatively low mileage bike that wasn't rusty, for cheap.
Don't polish your starter, BTW, it's not aluminum. I polished
off my old starter's paint, and it rusted, blegghh...
Starters go SPROING when you take them apart, too...
The hot wire on a starter is locked down to its stud with
doubled low profile nuts. Get or make an actual low profile
wrench to hold down the bottom nut if you remove it, or
you might be sorry... the insides wring off pretty easy, and
the plastic thing inside that gets wrung off is about the only
thing inside a starter that isn't on the parts fiche...
-Mike "a starter's worst enemy"