You are correct, they are about 2"+/- thick, thin gelcoat over maybe 1/4" plywood, 1 1/2"-2" Styrofoam & 1/8" paneling inside all sandwiched together with aluminum studs not necessarily on any kind of centers. Longer isn't what you want, it's larger diameter, probably need #12 x 1", be sure to use a stainless screw & washer if necessary coated with some type of sealer. Also check that they put screws in all the mounting holes on the arms, mine had 4 holes spaced from top to bottom with only screws in the top & bottom, I added screws to every hole & replaced all the factory ones with stainless.
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