A
I looked hard to avoid the dealer costs for injector O-rings for my 2009 M8. I found that O-rings for a 2002 Toyota Celica work fine. I found them at Autozone, GP Sorensen #800-9284 for $11 per injector. I fired it up for a few minutes and no leaks so I assume they will work fine. Thought I'd share.
http://www.autozone.com/collision-b...sen-fuel-injector-o-ring/423746_980702_11241/
http://www.autozone.com/collision-b...sen-fuel-injector-o-ring/423746_980702_11241/