The seat situation needed to change, and change fast. My wife, who loves the M1009, absolutely hates the seats. I found some subaru seats that would need about $200 worth of fitting and welding to make work, so I decided to cut my loses and go back to the wrecking yard and see what I could find.
I spotted some 1998 Chevy astrovan seats that didn't look too bad so I pulled the passenger seat out and while the height looked spot on, the bolts didn't line up. I got them anyway. The front bolts line up and I used the factory bolts to get the front down. The backs needed new holes drilled, and as much as I didn't want to do it, I added more holes to the body of my rust-free straight '09.
I backed up the new rear holes with some C-channel and a liberal application of anti-seize to the bolts.
OK, so if you want to replicate the project there's a couple things you should know. The astovan seats sit about a half to a full inch higher than "my" stockers (which are somewhat flattened). The driver's seat in its full aft position is just right for me, and I'm 5'8" tall. If you are taller you might need to drill four new holes per seat instead of only two.
The armrests are off in the pictures because I want new seat covers.
Please recommend some new covers. I don't want to spend $100 per seat for new covers, but they need something. I'm googling the crap out of the internet looking but if you know of something good and appropriate for a military truck, let me know.