I meant to ask if we still need seat measurements? And, if we do, exactly which measurements?
And, before answering, have you seen the page at Documentation/Interior/Seat Interchangeability?
My opinion is that people should NOT drill holes in the floor pan and space up with washers to install different seats. From what I've seen the bolt holes in our trucks are reinforced, although others have said otherwise. And if you drill and shim at the very least you should reinforce the floor at the bolt holes.
I've said this before, but there have been many cases in other vehicles of the floor pan breaking around the bolt holes if people drill holes and don't reinforce. I've not heard of that on the Bullnose trucks, but I believe that will eventually be the case. So I highly recommend you do not do that.
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI