Fixed (Riveted) Gooseneck

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Has anyone converted their sliding gooseneck (see top, right pict) to a fixed, riveted, gooseneck(see top, left pict). What parts did you use?

I'm thinking of using the parts for the Capri 16.5 (bottom pict); the Capri's at UCLA Marine Aquatics Center have something similar. Any thoughts?
 
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