Barracuda dash vents

They are labelled LH and RH and were installed on the correct sides. I'm sure they're not A-body vents as there is a 1/4 gap on the left side of the LH vent and 1/4 inch gap on the right side for the right one (refer to first picture of RH vent), and they were modified so that one side is 3 inch deep and the other is 3 1/4 inch deep (refer to bottom picture at the top of vent).