I know 1968-69 B bodies had them . and am pretty certain 1970-71 Cuda had them as well. give me till this weekend I'll look to see if I have any left here. ( used to carry them )
Re: 70-71 Barracuda tail lamp studs ? - 09/12/1902:26 AM
Here are a couple of close-ups of one from the 71 Barracuda (GK6) that my dad bought in 1971...with 13,000 miles on the odometer. It has been in the family for 48 years. The cap is just a little over 3/8 inch long.