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I also have the bracket that goes under the seat...

I just sold one with that part # and it came out of a nov 64 build lwb 45, titled as a 65!
number for the bracket on a 71 fj55 was 58830-90351. dont' know if that's still a good number
58708 CARRIER SUB-ASSY, JACK
58830-90351
Comes up as a valid number in ToyoDIY for both FJ45 and FJ55, but since no price displayed this usually means it is discontinued or replaced with a new number. Beno may be able to help further on the official Toyota USA channels. In anycase good to know one can be pilfered from a piggie if needed.
Steve
So I just ended up picking up a few parts.