This place has super low prices in my experience. The trick is going to be finding the correct color, there is a two digit modifier at the end of the 10 digit part number that specifies the color, sometimes after this many years they only produce the one color.
Center lap belt Earnhardt Toyota...
I’ve had (4) 80 series Land Cruisers, US spec, and an LX 450, have never seen one without that center seatbelt.
My guess is someone removed it for some strange reason.
It’s possible Toyota still sells it?