Careful of the ones you buy. I had one missing on my 68. I looked high and low and could find the right roller size but not the right shoulder size on the bolt. I took a new one and machined it down, added some flats and tapped more thread to get it to work. The window would not adjust correctly until I machined it to match the existing passenger side one.
Bought two: Brand new out of the box and reworked below it.
Jon