These are aftermarket deck wheels with hardware. All plastic parts are manufactured and in the USA. The casters have oil embedded bronze bushings meaning as the bushing is stressed and heated, it releases small amounts of oil to lubricate itself. Parts 4 Outdoor parts are made to be durable and long lasting. These rollers are compatible with SCAG models Cheetah, Cougar, and More Replaces Part numbers 481632 04003-26 If you have any questions on compatibility with your tractor mower, send us a message and we will get back to you