Now these things are cool; ive never seen these before. But I agree with Slick in stacking. I prefer tapping a hole. Would the ID be bigger than the OD of the bolt??? Maybe. I am like you and would prefer to use the same bolt. Now sometimes, you can tap the hole out. No reaming, just straight tap at a very slow speed. Then with the bolt, take a die and chase the threads. Normally there should be enough material to catch the threads. But if the ID is out by more than .3, then there isn;t enough material left and then those helicoils would be a great alternative.

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2011 E70 50i M Sport