Wrong floor patch?

Converting my 71 Swinger from 904 to A-833. The floor patch I have fits on three sides very well. the back of the patch sits higher off the floor than it should. Does anyone know if I got the wrong patch? Of course the number sticker is gone... Through visual comparisons online I have seen ones similar with the same or deeper rear section. Has anyone had any issues installing these? The only part I can read on the sticker is *****40C Sherman & Assoc.

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