[JScullin]

Walk through the process of what you removed to get to the starter. Airbox or any support bracketry would be my guess. Based on the corrosion it had access to the elements.

 

[JScullin]

Perhaps the bracket for the DPFE sensor. It's the black bracket in the 2nd image, between the header and blue clutch. There's a lot of lines running around there when installed so maybe you thought pulling that out would give you room but abandoned it. You can see in the image it's missing 2 bolts and IIRC they're 10mm ish.