64 Dart Seat Input??

I've got a set of 65 Valiant buckets in my 65 Dart wagon. I was thinking about adding a buddy seat but found there's not enough room between the seats for it. Will definitely have to check the spacing on a set of 66 Dart buckets I've got and just maybe that buddy seat will fit. If it all works, hopefully the new 65 seat covers I've got will fit with little or no mods on the 66 frames.