Most likely that InlineTube bracket could be modified to work, but might be just as easy to start with a piece of flat steel or aluminum stock and bend my own. It basically needs to look like this from above with an angle bent into the inner straight piece to match the curvature of the valance.
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Hoping to finish a project while I'm still able to push the clutch in....
1963 Tempest Convertible (Ram Air IV w/4” stroke), TKX, 9-inch w/3.70 gears and triangulated 4-link)
Pictures