1972 Bench seat track dimensions.

[gmc4x4can]

Hello, I'm looking at buying a bench seat for my 72 cab, It's the last big piece need to get my truck on the road. I've found one in my province on craigslist, but the guys not totally sure what year truck it's from, he heard it's from a 72. I'm away at work and my cab is in the paint shop so I can't measure the floor right now. I'm wondering if someone could tell me what the width is from the left to right track, either inside holes or outside holes would work I guess. He figures the tracks are about 45" apart. Thanks for the help! My truck wouldn't be where it is today without this place.