I mounted an 8 foot section of PVC drain pipe across the belly and store 30 feet of Blueline hose inside of it.
Try an exhaust shop that does diesel exhaust for the u bolts.
My question is; How did you mount yours?
I used a 4" set of these that I found in my local Lowe's Store. I can't find them online. I self-tapped them thru the underbelly and into the frame.