Injector rings?

[BigRb247]

I was jsut wondering if anyone knew where i can get new rings for my injectors. Not the little o-rings that go into the fuel rail. Im talking about the big black rings the go on the bottom of the injector (into the head) and the onee that sits between the fuel rail and the injector at the top. i bought used 550's from my friend and his were shreded. Thanks

 

[90GSTman]

Dealer has them $8 for a set of four. I got a set last week.