1993 spare tire mount

[clarencedonath]

My wife's Ranger was missing it's under-bed spare tire carrier. I have purchased and assembled all the parts up to what the hinge mounts to the frame. I'm unable to identify what that hinge attaches to. There are no matching bolt holes on the frame. I suspect there is a missing brace missing. This may have been removed by a mechanic when she had bed mount repairs done in the past. I am looking for a source for this missing part. A parts breakdown of this area would be very helpful. Thank you.

 

[alwaysFlOoReD]

This is on my 86 ranger. I installed it decades ago to replace a missing rear tank on the dual tank bed.

PS, I'm pulling motor and trans, all other parts are up for grabs. I'm near Calgary, Alberta.