I have not removed it yet, so I don't know if there are grooves in the bore or not.
That would seem like a very expensive way to do things, but I guess it's possible.
One thing that I am trying to avoid is removing it, and then having fluid come pouring out while I am sitting there with my "thumb in my ass" trying to figure it out as I go.
My current plan is to "cold swap" them; So in my minds eye, I would like to have the tube set up with the proper o-ring configuration and lubed, so I can undo the 2 retaining bolts and swap them right quick to minimize fluid loss.
But if there are 2 o-rings on each side, I need to be make sure I recover them all, before I jam the tube in, hence stuffing "3 o-rings" into a "2 o-ring hole".
It's probably taking me longer to type this than it will to actually do it......