Larry,
If no one responds by next week, I'll be back home then and I will check the set of 1953 A-D panel seats that I have in storage.
I think the sliding track would be driver's and the passenger seat pivoted towards the dash with a non-sliding/non-adjustable floor mount.
If someone with a 47-55 panel responds regarding how the two seats are attached, would that help? Or, do you want a response from a Task Force panel owner?