Roof Rail weatherstrip rubber from Metro TOO SHORT!??

[1966DartConvertible]

Received my roof rail weather stripping from Metro USA and upon installation found that the front pieces were about 2-inch too short (see pic). The same for the other side too...

Is it supposed to be this way? Or am I supposed to stretch it or something? Hmm... weird! It says '63-'66 A Body Convertible on the box:

Hmm...