[jimclemjr]

Do not know where this is but from my experience, I would take the part off if possible to accomplish the task. If a part of frame and cannot be removed then remove all panels around it.

 

[jimclemjr]

High graded bolts seem to be made out of superior materials that do not rust. Stainless fasteners that will take the load are hard to find and expensive. A lot of stainless on market these days is too soft. Get a fully threaded bolt if you have to and shorten it as needed.