Looking for T-Max or Technical pan glass plates

Hi all,
I am currently attempting an experiment that involves bleaching of
negatives. I am new to this sort of process but I understand that this
is typically donde with either holographic or plates or photographic
plates with glass substrate. (I am unsure of whether bleaching can be
attempted on your regular acetate or ESTAR-backed films or not) I have
asked our local and other vendors only to learn that Kodak
discontinued these products in 2001.
Do any of you know of other vendors or perhaps a distributor with a
backlog of these plates?

Thanks a lot,
Carlos