Threaded Holes Engine Bay for Relay Holder - size?

Hello!

I’ve recently purchased a relay holder from Cali Raised and attempted to install it in the pre-threaded holes in the engine bay on the drivers side. I believed these holes to be m8 x 1.25 however, the provided bolts do not fit nor do ones from the hardware store at the aforementioned size.

Does anyone have experience with this? I see many other threads but they are all eluding to the m8 1.25