Guys,
Standard metric sizes (cross section x ID)
Linkage/swingarm orings : 3.5 x 21
Shock pivot orings : 3.5 x 15
Also, another trick I learned, when using orings on the swingarm, there is a little too much room for them to walk out, as there are no washers there. What I do is use a 1.5 x 21 oring on top of the 3.5 x 21 as a spacer to retain it against the frame boss.
If McMaster does not have these sizes, try Oringsinc or APG (callapg.com).
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