Body swap question 4x2 to 4x4
 

I'm doing a body swap on my 74 4x4. I have a good cab from an 85 4x2 to use. I removed the bolt in floor hump from the old cab thinking that I could just cut out the required area of the 85 cab and bolt the high hump from the 74 cab into the 85 like it was in the 74. Somewhere between 74 and 85 GM changed the floor slightly and this won't work. I already scraped the remainder of the old cab so I can't cut any floor sections out of it to use.

My question is did the 85 4x4's use a different version of the bolt in floor hump like the older cabs?