Evening Brian. I had the same situation with my PB! Photo shows inside view of rad shell with all slats in place. I needed 2 slats and used a pair from a TC. Bob Grunau had some loose slats to choose from. If you look closely they are the middle pair. The profile of the slat is a little different than the PB's. I chose this location as they were 'sort of' hidden behind the center rib on the front of the rad shell. Hope this is of use to you.