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@36x18
Vello, you need to measure the length of the bolt you need to replace, not including the head, and get one that is about 10mm longer. If (a) is 10mm , it is probably an M10 x 1.25 thread size, but that is a guess. I wouldn't use studding as it is made to hold ceilings and ducting up, not huge engines.
Think about the clearance you have around the head, and whether you will be able to get a socket or spanner in there, or whether an 'Allan' bolt is a better bet.
I don't think Clerkenwell Screws will have what you need, but these people may have something suitable,
http://www.pro-bolt.com/