What are the advantages, if any of these? Are the stock ones a maintenance items and is this a good option. I see the one on ebay and pretty sure this guy has a good rep. thx

Have a link to the seller on ebay and what he is selling?

I replaced mine in my stock arms because the clips that hold the spherical bearing in the arms would not hold any longer, I greased the shit out of everything as I installed I never had any problems with them.

http://www.pilotodyssey.com/armbushings.htm

I think the kit for the Pilot is the same for the 400EX someone here can confirm?
http://www.atvbushings.com/index.html

http://www.ebay.com/itm/Urethane-A-Arm- ... ee&vxp=mtr

Thanks H, both out of PA so I think its the same guy.

If your not having any problems with your stock bushings I would keep them maybe service them by cleaning and greasing its a quality setup, I changed mine because I was having problems keeping the wire rings that secure the spherical bearing in place, hit a big bump bottom the stock shocks and it would pop the ring out of its groove.

Ok, Thanks for the info, good to know.