Towing a truck or bus often means pulling the drive axles. And a lack of oil can result in burnt bearings, scorched hubs and melted seals. These Axle Caps are equipped with an oil-access hole for adding oil to the hub prior to towing to prevent damage. 10-pc. Motorcoach Set fits most major motorcoaches, buses and RVs. Prevent Damage: Caps feature an oil-access hole that allows you to add oil to the hub prior to towing Easy to Use: Axle covers do not need gaskets for attachment Includes the most popular models for towing motorcoachesKit Includes: (2) MB-10D – 10 bolt for Mercedes Actros/Axor/Citaro/Setra 417 motorcoach/ZF (2) MR8D-1 – 8 bolt Meritor hub common on later model motorcoaches (5/8″ stud). HINO 268/333/338 (2) MR10D – 10 bolt Meritor hub, common on older motorcoaches (like MC9’s), and late model transit buses (2) V12-2 – 12 bolt for Volvo 9700 motorcoaches, Volvo B12 coach/Wright bus, Renault 240+450 (2) ZF10 – 10 bolt cover for the ZF rear found on Novabus and the new MCI DF45 motorcoach