ebay 1969 nova yenko/ grumpy car????

[YENKO DEUCE REGISTRY]

They are mounted pretty far back and don't appear to have the long retractor sleeve. They are not later versions because in 06B of '70 the Nova's switched to a non-retractor style where the strap simply laid on the floor. Not sure if it's my eyes or if they are Chevelle style.

The trunk floor side extensions have me puzzled as well....

Edit: as I thought, the '68-69 Novas have an 'ear' on the trunk extensions to help prevent stuff from falling down between the trunk floor and the quarter panel. They were no longer used in '70+ Novas, but are not on this car either. Perhaps they were engineered out of the '69 Novas by 04C?