I ordered a complete gasket set for my 78 550k. It said it included "all" o-rings. When I sorted them all out, I came to find that the o-rings between the block and head that seal off the oil galleries feeding the cam/valves were not included. So now I am left with the fun of finding two small metric o-rings. I looked up the part on powersportspro and found that the size is either 4.9 x 2.5 or 5 x 2.4. Does anyone know any chain stores in the U.S. that sell metric o-rings. I would hate to order a part like this from a dealer and look like an @ss. Thanks in advance
