Register with Cummins is where you want to start and a great idea
If you're taking the old parts off, most old parts have a number stamped in them and keep in mind tensioners / Pulleys / Belts are generic.
The pulley you will need the I.D. and the O.D. the diameter and the width and how many grooves ( if applicable) you will find many charts online with a google search.
The belt should have a part number on it also... and if not? you can route some twine /string around the pulleys as your diagram routing applies and measure the length and again count the grooves in the pulleys if applicable.
These coaches being like " Snowflakes " and in many cases even being the same make model and drivetrain in many cases no two being the same. I wouldn't count on what is on someone else's coach has to be tha same as yours.
Happy Hunting
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2004 HR Navagator 500 ISM
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