Here is a photo of front and back of 72 standard high back, no center arm rest seat hinge cover. Judging by the lack of a screw hole in your photo, it is not one of these seats. Sorry, I don't have any covers for the deluxe seats.
I believe I need these (ones pictured) exact hinge covers. I have a '72 340 duster with an all vinyl, no center armrest split bench seat. I have been looking everywhere online and cannot seem to find them. I checked the big names like legendary and year one. The only ones I have seen are "L" shaped (which appear to be the wrong style). Does anybody know where I can buy these. I need them in black.