I have a 2019 Rouge with a 72 inch deck.  It calls for a 5/8 x 204.75 inch belt.  The mower is a little over a year old and I found after not too many hours I was at the end of the threads for the tensioner adjustment.  A 5/8 x 203 Kevlar belt is easily available while a 204 is not.  I feel like I could easily do a 204 inch but not sure of the geometry involved with a 203 inch belt and hate to order online only to have to send back.  Any best guess or advice is appreciated .....