I would contact the seller about the problem before trying to modify it.
There is no thread insert to do what you want, the thread pitch is different from 1/2 to 9/16, the hole would be too big to tap for a 1/2 in repair coil.
A standard 1/2-13 thread bushing is 3/4-10 on the OD. Do you have enough room for that?
Possibly step studs could be bought or made, or the cover holes drilled, and 9/16 bolts used. Drilling the cover would probably be the best, the bolts may have been oversized for a reason.
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