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There is suposed to be a sticker under the hood for that. But the important stuff is what engine it is. Most parts places can provide the diagram if you find someone who knows how to use the manuals. Engine year, make and size are what you need to track this down. Good Luck
P30 chassis 454? If so, my 1982 Holiday Rambler uses 3 belts. The dash A/C belt is the outer belt that goes on the crank shaft, P/S pump, AC and the adjuster pully. NAPA part #257603 worked for me. That's not what's listed by the way.