I have been looking for deluxe rear belts for over a year. They are very hard to find. Snake-Oyl is a very good option, but one pair of deluxe belts is $250. Cost is $500 for the entire rear seat.
I bought a pair of deluxe front belts on E-Bay. I sent them to Snake-Oyl and they are now converting them to rear belts with new webbing and mounting hardware for $50 a pair. They will even pay you for the retractors.
The cheapest option is to buy a couple of pairs through any parts supplier and mount them. You can always stuff them behind the seat when not in use.
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