how many mounts do these use? there are 4 14mm bolts from the OE bumper and what else? wondering where the strength comes from to be able to winch out of a stuck situation. thanks as always.

 

This should help ya.
It's been linked here before, but I don't have an actual link of it and a few other things that are on my web site listed in my table of contents on my site.

The mount2 pic shows an empty hole near the rear, and I don't have a bolt in there right now.
But it's plenty strong.

 

Fill all the holes you can with all the bolts you have.

Winching is hard on everything, so you need all the strength you can get.

 

I installed one and if I remember right it used a total of 14 bolts. There are threaded holes all over the place on the frame. I don't know why Toyota puts all those threaded holes every where, but they are there and ARB bullbar designers took advanage of it.