The 4 smaller holes go all the way through, and should be threaded to receive your ABS ring bolts. You'll only need to use 2 of the holes of course. The back side won't look 100% identical to your old rotors, but the holes should line up fine. You got wrong parts the first time, but that was just a fluke. Try not to overthink it.

here's a better set of pics

98 Montero, 184k.