The 67 Shelby Mustangs received modifications to the rear tail light panel to fit the long style Thunderbird tail lights. The modifications made by Shelby American were rather crude. Jeremy at Maple Hill Restoration discovered more about this subject as he works on the "refurbishment" of this gorgeous '67 GT500.
One of the tail lights had been leaking, so special care was taken to prevent any further leaks (both water and exhaust). Check out the fantastic work!