NOS Polaris clutch factory speced for the 74 Custom 2 400, and Electra 440. These have A weights and a black spring. Will fit most 70 to early 80s lower performance Polaris trail sleds. You can easily change the spring, but weights will require drilling. The early 70s production clutches were not designed to be worked on. They wanted you to replace the unit. These were stored stacked in a crate without a box. Just dust and light tarnish. Before shipping, I open them up to dry lube the rollers and weights, so they will be bolt on ready. Make your old sled work like new again