Hard top weatherstrip

[Neil Schultz <NeilMGB@erols.com>]

    The foam rubber seal that a hard top sits on has deteriorated on
mine.  How do I go about replacing it?  I thought of using the
cylendrical foam that you wrap around plumbing to reduce heat loss,  but
that stuff is pre-formed and would be difficult to work with I imagine.
My selection either looks too thin or too thick, also.
    Thanks in advance,
-Neil '77b