Back years ago I worked at a tractor trailer (gas haulers) shop and we had a guy come by to pick up our shoes for relining. The place was in Charlotte N.C. and I believe may still be in busines.
I would suggest asking one of the local big truck shops who does the shoes for them and maybe, if they're nice guys they would even get them done for you....or at least tell you how can do it local. The advice above is great, I'm just trying to give you another option to help if needed.