If you don’t need a full floorpan, Autobody Specialties (IIRC) sells fronts and rears for early A’s that fit quite well with a bit of trimming over where they fit over the inner sill. If using a front and rear pan, it leaves about 6-8 inches of original floorpan between the two. I used a less expensive 67-later pan in a 65 Dart Convertible years ago as they were all that was available at the time. Lots of work to get them to fit right, especially since the early pans are now available.
