My 5.9 into '68 Dart swap

I am using the Dorman A/C delete bracket and the van power steering pump. I went through a couple belts and found a 7 rib that fits. I'm out of state for work but ill be home this weekend and get a part number.
Cool a part number would be great. I’m good for now but at some point I would like to put a/c on the car and then I will need a longer belt