[Igofastr]

I drove for years with no problems using slip-fit connections.

If the fit has worked loose over the years, why not just buy an expander and tighten thiings up?

I've done this (though not on a cobra), worked like a charm, and was much easier, quicker, and cheaper than adding flanges. No doubt that adding flanges is the ultimate fix, but probably not the only satisfactory and workable one.

Just my 2 cents.