90 GMC 1/2 Ton 4x4 Regular Cab Long Bed

I just got a Reese hitch for my truck from my uncle. He said it came off of a chevy just like mine and it should fit. I know I have to get under there and see if it does indeed fit. Does anyone know if the holes on my truck are pre-drilled in the frame? How many holes should there be, or do I need? Is it 2 bolts on each frame rail? Thanks of the help.

most are 3 bolts for each rail and the holes should already be there.

90 GMC 1/2 Ton 4x4 Regular Cab Long Bed

I just got a Reese hitch for my truck from my uncle. He said it came off of a chevy just like mine and it should fit. I know I have to get under there and see if it does indeed fit. Does anyone know if the holes on my truck are pre-drilled in the frame? How many holes should there be, or do I need? Is it 2 bolts on each frame rail? Thanks of the help.

I recently installed the same hitch to my 88 GMC Stepside and the hole where already drilled.