Clarification and Measurement re: 1969 Barracuda Backup Lights
(I edited my original post)
You have done the best thing asking for dimensions.
Just be sure the dimensions come off of OEM original parts.
A friend had a repaired panel on his car and some of the holes are missing
69 on left 67 on right
Alignment pin on left of drivers side bezel
Left vs right (both 69)
The reason I know this is I reproduced the bulb holder and in test fitting learned that if the left and right were switched side to side the lights pointed outward rather than straight back. Many of the OEM chrome bezels are missing the alignment pin due to corrosion.