This is for a Black Billet Contrast Cut Spike Oil Cap. It comes with a new o-ring all you have to do is just install it. Installs in minutes, no modifications required for installation. 
A Chrome Billet Gsxr Oil Cap 

Fits All Gsxr's & Hayabusa's 

Don't be fooled by price . The quality of our product is superior to the competitions. We go the extra step and effort to insure this.