Bucket Seat Rails/Tracks

66 are slightly different because 66 had a completely different seat frame and measurements.

your best bet is 63-65 A body ...they are kinda rare and might be a bit costly when you do find them but there is nothing like original parts that fit the way the factory intended.

Good luck on your quest, I just went through this for my 63 Valiant so i can say that it will be really cool when you get it together :)