Need Windshield Lockstrip for 68 Dart Convertible

My 68 Dart convertible needs the lockstrip that fits in the window rubber at the base of the windshield. Looks like it is plastic. I looked at some aftermarket stuff but mine is way different than theirs. Please see photo. Mine fits into the channel but the lower portion convers most of the lower rubber (which was overpainted green ). It what I have original? Does anybody have a source?
Thanks,
Bill