The fellow below has worked on my am/fm/8track unit (from a Camaro late '70's) a couple times. Grandpa's Radio Shop 519-576-2570 George Found 26 Queenston Cr. Kitchener On. N2B 2V5
I had good luck on a couple of radios with Robert Pacini; not sure if he does 8 tracks... http://www.v8buick.com/index.php?threads/factory-am-fm-radio-resto.344441/ Patrick