We do offer 63-66 Dart/Dart GT/ and convertible trunk mats....listed in the "TRUNK" chapter of our catalog....in either light duty vinyl or the heavier rubberized versions.
That sounds great! BUT, it doesn't show up on your page.
I've looked here at work, on a WinDOS machine, and at home on my Mac, and the page is blank for the trunk mats, for '64 as well as all the other years and models I mentioned above.
I think your page may be messed up.
But if anyone has bought either of these, I'd be happy to hear what you think and how they've held up.