I finally recovered my seats. I've had these seat covers sitting in my garage since October. These are an ebay purchase (US Auto Seat Cover) but they fit just fine and the material seems to be good quality. It took us maybe 4 hours to remove the seats, take them apart, recover, reassemble, and reinstall in the truck. I haven't decided what to do with the armrests yet - I didn't buy the replacement arm rests in the matching color because I never use them, but it leaves this weird hole where the armrest was in the upper seat back and unfortunately the seat covers didn't come with any velcro in that spot so they don't stick to the foam. Other than addressing that, I just need to paint and install my defrost vents and the interior will be complete.
And here is a picture of the heater levers that one of the previous owners made out of a framing square. I have to admire the craftsmanship here as they are much stronger than the factory levers and I'm sure it took some time to make these.