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All good input, thanks for the responses.
However, no one answered my original question - how long does my bolt hardware need to be to go thru everything, without being too long? Is there any interference behind the holes I need to worry about, or is it mostly hollow?
Back to the riv-nuts: The 8mm's I picked up today from NAPA called for a Z size drill bit, which is a whole lot smaller than what GM called for. According to the interwebs, Z is between 13/32 and 27/64.... I'm sure I'll have no problem finding that bit at my local DIY store............ Regardless, I'll be doing some rivnut testing before I go a-drilling.
Thx
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