The M715 wheel cylinders are handed, the Goat cylinders work in all 6 positions, they look the same but are not. Best to have your shoes re-lined, I know of no source to purchase ready made shoes, there is a place on ebay with shoe linings and a good deal on 6 new cylinders. I think all of us here have had to rebuild the brake system, Saturn surplus has new master cylinders as well, best just to replace it all or you will be doing it over again when the next item fails. I have brake work posted in my goat restoration thread with pictures. Look forward to seeing pictures of your machine.