Ours failed while putting the spare up.
I took it apart to see if I could repair it. The PLASTIC block that lifts the cable stripped out the threads that rides the worm screw.
Not repairable.
I bought the one Carl mentioned above.
BAL 28218 Hide-A-Spare Tire Storage - I-Beam Underslung Mount
https://a.co/d/30pPLF9
It was easy to install I used the same holes as the old one.
However...
After installing the tire on the carrier I lifted it and tried to slide it into place (like a trombone). The middle bowed under the weight of the tire. It would not slide in.
I had to lift it up then set it on my lap, then use my knees to lift up the middle under the tire before I could get the bars to straighten enough it to slide into place and lock it in.
I threw away the old one. I wish now I had saved it to see how much it would cost a machine shop to make a new block out of brass or aluminum. That would make the old one last forever.