520 rear sprocket

Finally got my 520 front and rear sprockets from KTMTWINS. All fitted, can't wait to try it next week on the track.
However the rear's aluminium so don't know how long it's going to last !!
It's pretty pricey from KTMTWINS so looking for other options when it comes time to replace it.

Were do all the other 520er's get your sprockets from, any pointers would be great.

Cheers

This is who I use. $56 for 7075 anodised black any number of teeth. Will do other colors for same price. Hard ano is dark gray and about $5 more.

Excellent quality and the best CS I've had in a long time.

http://www.pmpsprockets.com/

John