Finally canada post strike is over and I received the orings, #12 on the diagrams.
Because the guide rail gets installed at an angle, unless i remove the head, I guess I wasn't careful enough and damaged one of the orings.
Gotta order them again lol!...
I should've installed the guide straight, over the orings, let it sit for a few hours to compress them, and then i would've probably been able to install at a slight angle.
End of October it's getting cold lol. I think I need to start swapping the wiring harness fast. Once it starts snowing it will be too hard to do all that outside...