Seatbelts are interchangeable with 1981-1987 Isuzu P'ups. Don't try to get just the retractor, get the whole thing. And since the federal regs changed through the years, seatbelt behavior may have changed. I don't know if your '81 seatbelts do a one-way ratchet thing, or if they allow two-way movement. Seems like the early retract systems were like boa constrictors, once it took up slack, you were pinned in.
I'm curious about seats, too. I've heard of lots of different ones being used, but I just don't know how much work is required. One guy even put in leather seats from a Cadillac Seville.
Jack
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'83 Isuzu P'up Diesel LS - Original Owner
JoeIsuzu@IsuzuPup.comIsuzuPup.com