I go to Jenny at sew-classic.com first when I need something for one of my old gals.
She also re-wires potted motors for 15-91's and 201's at a very reasonable price. I don't mess with anything electrical and it's nice to have someone who's so good with it available to help me with these. They come back to me clean as a whistle and they run very smoothly and quietly once they're re-habbed. The last one I sent her was in terrible shape and I was afraid she wasn't going to be able to fix it, but it's just perfect.
Jenny is the stuff! :)