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It's just a piece of regular 6" C channel like your drawing. I didn't have a tire carrier to measure from either; I looked at photos and just measured what I had and made it work.
The 9" right triangle will give you the angle. I basically just centered the tire on the tailgate and it came out fine. There's plenty of room on the screw jack, even if you're on a hill.
Screw jack
https://smile.amazon.com/dp/B0711T2L8S/?coliid=IZFR0EG4OW5FI&colid=1Y8DD2SPA9STY&psc=1&ref_=lv_ov_lig_dp_it
Hinge
https://smile.amazon.com/EMS-Offroad-Tire-Carrier-Hinge/dp/B074Q2NY74/ref=psdc_15706921_t1_B074Q26H67
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