hi all don here i did some lookin on the web and found out k&n has a air filter for these two atvs
2004 eiger 400 auto 2x4 all
400 man 2x4 all
400 auto 4x4 all
400 man 4x4 all
2004 vinson 500 auto 4x4 all
500 auto 4x4 camo all
2003 eiger 400 4x4 400 all
400 auto 2x4 all
400 auto 4x4 all
vinson 500-all
2002 eiger 400 man 2x4 all
400 man 4x4 all
400 auto 2x4 all
400 auto 4x4 all
vinson 500 500 all

[img]i/expressions/face-icon-small-cool.gif[/img] the k&n part # su-5002
at auto parts stors atv motorcycle shops and boat shops
if anyone is intrested or let me know if you have tried this airfilter already on your atv and if it works or not hope this helps take care all