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Front pass side top frame rail......some are elsewhere,but mine are there......and I have had 10 53-56 effies this year. Now I have 7...or maybe 8.....anyhow look there and sometimes it takes a grinder of wire brush to find them.....Bill
Bill is correct-look forward of the cab mount along the top rail up to the largecrossmember that the radiator sits on. My 56 is along this rail. My 54 is on the crossmember.
Good Luck!