The plans wing struts on the LE/XL are 1-1/4" x .035" 6061-T6 but due to a shipping error I am using 1-1/8" with 1" x .058" steel inserts. I checked with Leonard who said it would be fine. Per the plans - "CLOSE END TO FIT FUSELAGE FITTINGS "HEAT" USE VICE", I have done just that to make the 4130N steel inserts fit the fuselage fittings.