I'll measure them next time I'm at the hangar. I'm sure they are just the wrong ones, but the story goes that they are what was installed on this particular airplane. thought it was worth asking.
I need to purchase front seat rails, so the last time I was at THE local distributor they had a variety of lengths, and couldn't really tell me which were for what configuration. I measured what I wanted out of another aircraft but have not returned to purchase them yet. If anyone has forward rails available I would love the opportunity to purchase. I wrote it down somewhere, they were 51 or 52"? Guess I'll have to remeasure...
I don't know how much it matters but the bottom chunk would be a bit aft of that position.
T-6G IPC shows the rear seat assy as 168-53002-3.
The vertical tubes are 168-53019-1 L and 168-53019-2 R as listed for the 168-53002-3 seat assy. There is a cross brace over top from tube to tube 168-53011-10 with 2 pulleys for the shock cord seat adjuster cord.