This 3-1/2 inch by 1-3/8 inch by 1-3/4 inch replacement spring pad is designed to replace the OEM 3-5851-01. Made of hyper flex polyurethane, it offers durability and flexibility. Available in red or black, this pad is sold individually and serves as a direct replacement for the OEM 3-5851-01 as well as the Atro SC99-34101. With its practical size and reliable material, this replacement spring pad provides a reliable solution for your needs.