Murray Fuel Cap part# 92317 supersedes to part# 92317MA. This fuel cap has an inside diameter of 2" and was used on the following riding mower models; 42531X7A, 42531X8A, 42561X8A, 42561X8B, 309000X31A, 309001X48A, 309008X99B, 309029X92NA, 405000X8D, 425002X99B, 42516X92B, 425615X99A, 425618X48B, and 425620x99B. There may be models that use this part that we do not have listed here. Please refer to your owners manual or a parts breakdown for your model, to assure that this is the correct part for your machine, before you order.