i wouldnt rely on the OEM threaded nuts - as they will but under quite alot more stress compared to the oem bar.
You are supposed to drill them out with a 3/8 drill bit , so the 2 bolts can fit and grip the backing plate easily.
This "plate"at the rear is one part of the increased subframe reinforcement.
i installed mine on an EG and the holes were a bitch to line up.
do new holes i say. Extra strength and possibly better alignment (depending how you drill the holes)
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