Mark, sorry, I've been holding off on this, but I can't wait any longer.
Is there some reason you can't just open the kit and measure the size of the holes in the ribs?
Of course there is. Two reasons in fact.
1) Dozens, if not hundreds of Brodak kits have been built by guys here, and I figured someone would know off the top of their head without me making another mess digging the kit out before I have the bench cleared and ready to go, and
2) It's fun watching people hold it in and scream at their computer screen, "WHY DON'T YOU JUST OPEN THE BOX AND LOOK!!!"
Mark