I assume the captive bolts are what I called the studs. I.E. Half the sump was held on with normal bolts, the other half have thread coming out of the block and you put nuts on.
I found the base of the captive bolts was larger than the holes in the sump, so the only choice was to remove the captive bolts and use normal bolts, or widen about half the holes in the sump.
Sounds like exactly what you have found also.
I removed all the captive bolts/studs and used normal stainless bolts and RTV silicone.


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I bought a stud remover tool to get a few of them out. Some came out by hand or with multi-grips or double nuts, but there was of course a couple that were bastards. 


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