If you know the length, and the proper width, just go to a good parts store (not one where the pimple faced kid must know what car year and model to punch in the computer before he can decide whether to take a whiz or not). Belt numbers are coded for those dimensions. If you get good and friendly with them, when it comes time to buy hoses all you'll have to do is bring down your pattern (usually a bent piece of welding rod, or other light wire) and they'll let you search the rack for the right shape molded hose (even if you have to cut one down for length). That way you won't force yourself to use the ribbed tickler redneck hoses.