The Arnold 42 in. Lawn Mower Deck Belt is for tractors with 42 in. decks. When it comes to replacement parts for lawn and garden equipment, one name is synonymous with premium quality: Arnold. Arnold's wide variety of high-quality parts, including mower deck belts, will add years of life to any mower, tractor, trimmer or chore performer. Our universal parts for lawn mowers, snow throwers and other equipment are compatible with most makes and models, so anyone can easily find the lawn mower belt replacements their machines need. You know you'll be able to get the job done right with Arnold.