Bob's BMW in Maryland will sell an oil change kit for airheads that includes the white O ring and all crush washers that you need.
Yes, it costs more, but it's a nice option, and you don't have to worry about getting the correct part because they're BMW parts.
"By the way, you don't have to be sweaty and holding a basketball to enjoy a Gatorade. You could just be...a thirsty dude! Gatorade forgets about this demographic!"