Rear Seat Conundrum

Well, maybe here’s a new one, but maybe (hopefully) not. My 1974 Duster is more or less complete now, and anyone who followed the build knows I bought it mostly as roller/former drag car. The last thing I need for the interior is a rear seat- unfortunately it looks like the previous owner ground off the floor brackets. Anyone ever encounter that? Any solutions out there? Search function yielded nada.
Thanks guys.

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