The spec's AdvGa refers to are the O-ring I picked up from Ace Hardware. The KTM spec's are for a 27.5mm x 2.5mm but the local dealer didn't have one in stock. I headed to Ace and couldn't find anything in the metric O-rings but I did find one in the standard O-rings that converted to very close to the size needed. The Ace package was for a 1 1/4" x 1 1/8" x 3/32", #77 O-ring, stock no 35716B.
Why are we stopping? We don't have time for that!