You must work for Microsoft. Even though your answer was technically correct, it really wasn't very helpful. Can't you post a good clear photo of the tag?
Here is as pic of a general 66 tag.
Is your 6 definitely under the small t or the p
1966 Lowercase Alphabet Codes
.a 6 = Console
b 4 = Bucket Seats
b 5 = Rear armrests/ ashtrays
f 6 = Rear seat speaker
g 6 = Bumper revel molding
h 7 = Fender Mounted turn signals
m 3 = Door upper frame & quarter molding
n 9 = Lower body molding
p 6 = LH remote outside mirror
u 1 = Sold car (special order)
The codes I have found for 66 barracuda ending with 6 are. These are from the factories 66 barracuda's ordering information. Some of these can be eliminated right off as they do not go on that line on the F-Tag.
x - 306 - Black vinyl top
406 - 3.55 Gear ratio
416 - Heater delete
456 - Power steering
x - 486 - Console
x - 536 - Left remote mirror
646 - Emergency flasher (NY mandatory)
676 - 6" spotlight
686 - Built to Canada Spec's
x - 696 - New car sales w/5 gal gas.