My 1972 F7 Dart Swinger
Not exactly positive but I got them through Dante's. Here is a link to what they offer now claiming to be a Must for a top restoration. attaching a pic of the receipt also because the part # on it is 99W which is different. I bought them 7 years ago, as you can see by the prices! Time flies, LOL, so maybe they've changed. I can't believe they wouldn't have gotten a lot of complaints.
On another point, I don't know where you got those seats but they look Great, almost like they could just be patched up by a good shop. Mine were really rough.
https://dantesparts.com/i-30498730-...y-b-body-and-e-body.html?ref=category:1389293