The Paccar Bellow Kit for OEM Number M66-4111 and M66-3541 is a durable and reliable solution for Paccar trucks. Constructed from 321 stainless steel, this kit includes a 4-inch diameter, 12.6-inch long bellow, a 4-inch diameter flange and flare, one bellow, two rings, and two clamps. Sold by kit, it fits most Paccar trucks and compares to OEM M66-4111 and M66-3541. With its high-quality construction and comprehensive kit, this bellow kit offers a practical and effective solution for Paccar truck owners in need of a reliable replacement.