Serpentine Belt for Cummins ISB 6.7L?

RRE wrote:
I am looking to purchase a spare serpentine belt for my 2009 Winnebago Journey 34Y that has a Cummins ISB 6.7L CM2150 (350hp) rear pusher Diesel engine. I can't find the part model number in any of my owners manuals. Can anyone assist with this and where I can purchase one? Thank you

If you're sitting still for a bit, remove your old one and take it to Napa. Keep your old one for the spare and one you know that will fit.
Most likely you'll never need it anyway.
Never carry a new spare that's never been installed and with assuming that it will fit properly.