Tony,
I had shoes relined for another car I have by Rochester Clutch & Brake. I called Sam. Here's his contact info:
Sam
Rochester clutch and brake
827 Phillips rd
Victor ny 14564
585-924-3717
I just got the car running late last October (not a Buick), so there's only a few miles on it. I should have a better handle on how they work this summer.
They relined the shoes, machined the drums and arc'd the shoes to the drums for less than $300. of course there's shipping, but that should
be quite a bit less for you than out here in the still frozen, windswept, overcast, sunless and starless northern plains. Hope that helps.
Mark