Pro Parts Headers???
I just went and snapped this pic, I dont have one that showed a general shot of them.
My frame in that area is 6" off the ground, the collector tube is 3" and the bottom of the flange is 2.5". It drags a lot, and it currently sealed with 2 gaskets and a tube of copper RTV. Lol
Let me know if other pictures would help, access is limited since theres not much clearance, but I can try!
Edit: I measured at about the midpoint from where the tubes merge and the collector flange is.