This set of four exhaust valve springs have been made to the original prints and specifications. The following Overland models use four (4) of these springs: Model# 37, 38, 40, 41, 42, 44, 45, 46, 47, 49, 50, 51, 52, 53, 54, 55, 56, 58-R, 59-T, 59-R, 59-C, 59-LD, 59-EX, 59-D. 60-T, 60-F, 69. The following Overland models use eight (8) of these springs 65, 65-A, 79, 80, 81, 83, 83-B, 85-T, 85-R, 85-C, 85-SN, 83-BOE and ST. They are Willy-Overland Part Number 2016.