Bill, yes, that was like that from the factory. The factory covered that small triangular portion with a small piece of vinyl attached directly to the steel floor and door jamb to match the color of the interior. You may (or may not?) recall having to peel those pieces of vinyl off when taking the interior out of your car.
Or perhaps a previous Owner removed them and tossed?
Or dig through your boxes and bags of parts and you may find them. They are kind of a triangular shape with legs in two directions. If not, you can use some vinyl pieces that match the rear side panels or seats.
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold  1980 T/A SE Bandit - Sold
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