any dealer , GM or suzuki
or
from any Fuel injector repair service like witchhunter dot com
they all carry these parts.
but many parts stores , like AZ, and the like, dont. (few).
my partsamerica.com search nets zero. as one example.
the tip of the injectors needs VITON so dont be tempted to use ACE hardware, plumbing o-rings. cheap ones, hate heat.
and gas leaks on injectors make a real nice fire going down the road.
i get all my o-rings here, but you need to know the size first
and 3-5 days lead time. ship.
O-Rings, Inc. Since 1958 - Buy Online
just get viton
the injector service joints can tell you, the size if you ask them.
they will tell you , cuz they dont want you on fire. see?
hope this helps one and all.