I don't know of anyone local to us,but either one of these have done nice work for me.
Greg Ward
Ward's Classic Radio Restorations
131 Culps Drive
Huntsville, AL 35811
(256) 852-0955
http://www.wardsclassiccarradiorepair.com
Jackson Speaker Service
3921 Pine Crest Court
Jackson, Michigan 49203
(517) 789-6400