I've never really paid attention to the tags on the seats. From your photo, though, those are definately first gen seats. There is a small possibility that they came out of a 9000, but I highly doubt it. They came in Saab 900's (both 2 and 4 doors, and the 5 door hatch) from 79-93. '93 was a change over year, and only the 'vert kept the early body style. Again, I'm not sure if those seats would work for your application. You may come across a Saab 99 (it's a model, not a year), and the seats will look similar, but they aren't the same. They usually have a sort of crosswork piping on them, and generally look a bit cooler than the standard 900 seat.
The buckskin/tan I was talking about was available from '85-'89 I think. The later years went to a bit more of a yellow color, but they would probably still sort of match your door panels.
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File comment: Can't find a good photo of my old Saab, but this is the color I had in mind...
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One thing I will definately attest to is the durability of the cloth fabric. If you keep them clean, and keep from tearing the vinyl, they will outlast pretty much any car you put them in. I hope you keep them, but I looked at doing this, and wasn't happy with the seat angle in the Luv. I'm just under 6', if you are shorter, you could probably make them work just fine.
There are several other mini-trucks that you can snag a bench from that will just about drop in, and ctmandu has a set of Recaro's in his truck. I think Astro van buckets, Geo Metro buckets have been used too. It's your truck, so you decide, but seats are a pretty big issue if you plan on spending much time driving it.
Don't mean to hijack your thread, your truck is coming along very nicely, should be a sweet ride when you've got it together. I need a bit of impetus to pick back up on mine, if you use these seats, I may just look at putting a set in my truck. They are really comfortable and durable.