Installing a new ACDelco steering box on a 83Z. Didn't notice that this new one has 4 mounting holes/ears instead of three like my 86 Iroc, till I went to install it. The extra mounting hole is hitting the frame rail, preventing the rest from sitting flush against it. Part number on the box list: 36-0516561, which should be what I need. Stamping on the steering box is: 5687962. Either way it looks to be the wrong one, but want to make sure that the early thirdgens weren't different in someway.

 

My 82 had the three mounting ears. Looks like the wrong box.

 

Cool, thanks.