Just looked at a 65 Dart gt with complete dash , they are in the same holes that the original gauges were in . Speedo too uses gps for speed readout.
Moe
Do you have any pics of what pcs's you need, and what type fasteners you need.. You know with a lot of patience and a smooth hard surface ,small hammer and a brass Punch you can remove most of your dents.
Moe