I don't seem to have privileges to post on the RW19 site but I am able to view it. Don't know why....if some one can explain this... Thanks. In the meantime I'd like to say that I used these same bushings to double my vibration proofing, by placing a set between the engine and the mount, and again between the mount and the airframe. My engine is the Kawasaki 440A 2 stroke, mounted inverted, with PSRU above. will let you all know how this works when I start my taxi testing, sometime in the near future.