Add to Favorite Sellers. Factory Second Stainless Steel Muffler Fits International Tractors 370644R91. Aftermarket Muffler / Factory Second, minor dings & scrapes in the cosmetics are expected, should not hinder the function & quality of the product Fits International Harvester 340 504; 460 544 560 606 656 660; IH Indl: 500 SN: H2371 & up, Crawler; 2544 2606 3514 3616; 2656; gear drive; 2504 gas LP & diesel Tractors Specifications Dimensions: 2.063 inlet length, 2.400 inlet ID, 2.540 inlet OD, 12 shell length, 6 shell diameter, 13 outlet length, 2-1/2 outlet OD, 27-1/2 overall length. Polished Stainless Steel, Baffled like the original, Embossed with IH and PN, Vertical round body, Heat will cause the stainless steel to turn a golden color but can be polished back to the original color Replacement Numbers 370644R91 370773R91 403550R1. Thank you for looking! We appreciate the opportunity to earn your business. Feel free to ask any questions you may have.