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It's been a long time, but it might be that the floor is not "level" between what will be the bucket left and right bolt mounts. What I'd do is something like this: Put a long straight member, either a nice straight piece of wood or steel, all the way across from one door kick to the other.
This will now give you a fairly parallel place to take measurements. You can now measure down to the existing bench mount holes, and they should be the same left/right. It's entirely possibly that the front/rear will be different.
Because of the construction of both the floor and your new seats, I guess what I'm trying to say is that the inboard brackets may well turn out to be a different height than the outboard mounts.
You can do the same with the new seats. Just set them on a bench on scrap pieces of wood, and level the seat left/right. Now you can measure the bracket height to the level workbench or floor.
Also be aware of front / back tilt, which may turn out to be different on your floorpan as opposed to the floorpan of whatever they came out of. You don't want to end up with your back pushed forward or "laying in the back seat!!"
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