I have a pair of V-belts that came with my boat. They may be for an Onan genset which was once in this boat. They are stamped "17400 Made in the U.S.A. 4=239" on them. I measured 40 5/8" perimeter, 1/2" Width, 3/8" Depth. They look new, no cracks. $10 for both. Cash Only.