Recommendations for Tire Mount on existing bed rack

Currently have a 12.2" High Overland Bed Rack by Hooke Road on my Tacoma and want to mount my spare tire.

Can anyone recommend a locking mount that works with my existing rack?

 

Picture of said rack would help

 

Sorry about that - here are some pictures.

 

Well it definitely will have to sit flat on top. Will a 12 x 1.5 bolt for thru those open slates?

 

Yeah, that size bolt should fit.

 

Well you could make a plate to mount to the rack and run long enough 12x1.5 thru it that can thru at least two wheel hole and use a couple locking lugs to hold it down flat on the rack.

 

I have several ideas in my head.