i think some of the axle rebuild parts come from over sea's. marlin seems to be pretty clear on that his suspension, crawler parts and stuff he makes is from the USA.
this is directly off marlins site
Knuckle Service Kit
Includes all the standard knuckle service parts: wipers, felts, gaskets, lock washers, inner axle & bearing seals, hub gaskets, knuckle shims, and High Quality Japanese NSK knuckle bearings. This is not just another no-name knuckle bearing kit!
also you did buy off ebay, probably b/c their price was cheaper than Marlins, and that is the chance you take, you never know where the stuff is coming from when you buy off ebay.
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