Can I get away with a 0/12 to 6/12 flashing boot on an 8/12 roof?

[Nateums]

I'm looking at a kit from tractor supply for my shop as I'm trying to keep things cost effective. The roof is corrugated metal, so with the bottom edge sitting on the corrugation I may be more like a 7/12. I'm guessing the cost will go up by a few hundred bucks if I can't use prestocked kits.

(broken link removed)

 

[begreen]

A metal roof flashing is needed for metal roof installation. The flashing in the kit if for conventional composition roofs.