I am using a PA Racing K and it works with stock arms and struts. Fit was excellent. Only thing you would have to do is make the hole that the motor mount a little bigger or grind down the nib on the motormount. I choose to make the hole a little bigger. No creeks or noise. Original filter works with it as well. If you order one you need it to have spring perches and motor mounts! That goes for any K that you want to use stock hardware with. I am sure everyone will have their own opinion, but it is working great for me and I have never heard anything negative about the PA Racing K member.
Here is the site:
http://www.paracing.com/
