GT6 Hatch Window Gasket

[Mark Saffian <saffian@direcway.com>]

I replaced my GT6 rear window gasket last year with one from VB and it's
cracking in the corners after less than one year.  Since the part cost $19
and installation was $85, I'm interested in getting the part right this
time.  VB's part obviously came off a roll with no pre-formed corners.  Does
anyone know a source for a gasket with pre-formed corners that won't crack
from the stress?

Thanks.
Mark Saffian
Farmersville, TX
1973 GT6 Mk III   KF22412U