Depends on which ones you buy. I think most are standard... mine are 10mm x 1.25 pitch.
Tap on the lower tang about 3/4 - 1" from the weld line, below and slightly ahead of the rear axel (depending on chain tension) - eyeball it to where there will be the best material coverage, and where the bolt will catch the front and back of the tubing walls. Drill, tap appropriately, slather with hydrophobic grease, then clean the threads and green loctite. Voila.
If you are uncomfortable drilling into your frame... get a mech to do it. It shouldn't cost much at all as it's basic shop work and doesn't require any breakdown time.
I actually like this location better than stock as it give more rear wheel ground clearance, though at the expense of clearance ahead of the pivot.
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