I believe RD350's and RD400's use the same size fork seals, except for Daytona's which have different diameter fork tubes. Can anyone confirm for me?
That's correct.
Thanks again Joe!
1973-75 RD350 & 1976-78 RD400 34mm x 46mm x 10.5mm
1979 RD400F & 1984-85 RZ350 35mm x 48mm x 10.5mm