Okay so today was more progress.
The POR15 was hardened and I obviously did something wrong as there were blister holes in it all over the place and foaming in some places. Most of it is fine but I am concerned about a few places and will strip the coating and redo those areas.
My guess is that I didn't get to it early enough in the day and as the sun moved behind the house the dew was starting to set in while I was applying the POR15.
All that aside, I pushed forward on the seat install.
First I worked on getting the seat frames mounted in the cab. These seats came out of a 2003 F150 so they are in no way close to being a direct fit. It also became apparent to me that the floor of these trucks is in no way symmetrical from the drivers to the passenger side. The 03' F150 was symmetrical so both sides will require different modifications to fit.
Anyway I started by mocking up the location of the seat frames in the cab. The rear holes ended up at 13 1/2 inches from the back wall in relation to the upper part of the wall below the window where it protrudes out. I guess I should measure from the lower section of the wall but was working from a dimension I worked up with the seat in the rearmost setting.
I had to cut one of the mounting tabs off the oassenger seat frame to even get to the mockup stage. It will get welded back on in a different place. Additionally some of the side frame on the inside of the passenger seat frame had to be trimmed. I took off more than I needed to but didn't realize it at the time.
Here are the seat frames as I first found some balance between the 2.
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A little more measuring, checking dimensions and making sure things were centered in the cab and and a couple holes were drilled. After that heights were set to account for the sound deadening and carpet thickness. Then the second rear holes for each frame were drilled in the floor.
Here are the frames as they sit now. Both rear bolts are installed at this point.
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So unfortunately all of the front mounting brackets for both sides will need to be cut off, refit and welded back on. Not a big deal really just more work.
At least it's all coming together fairly easily.