Gti-r injector o-rings

[NMs14.5kouki]

I have been searching for some of the lower o-rings for the gtir stock itb manifold, they are the bigger ones that sit in the manifold that the injector sits onto. i want to know if anyone has the nissan part number for them? or if anyone knows what other ones would work in their place?

here is what i'm talking about.
http://img34.imageshack.us/img34/286/img4559t.jpg (http://img34.imageshack.us/i/img4559t.jpg/)