I grabbed the Napa 338s today and put them in the yokes no problem. I've done much harder u joints. I like the zerks and will not to forget to use them....wonder why Polaris didn't us them there...rough service in a grungy location. Total failure in every cup....next, front right cv joint. Thanks everyone!

 

They were called "cross kits,non greasable" Just like the missing zerk fittings on later model ball joints,they were supposed to be "lifetime greased"