"Booster Dewey" is the man for redoing these, in my opinion. I have a rare hemi Bendix booster and needed a rubber bellows for the back end of it and he is the only person who knew about it- and actually had one!
His business is Power Brake Exchange, 4533 SE Division Street. Portland, OR 97206. Phone 503-238-8882. He is very friendly and knowledgable, and will probably know the answer to what is correct for your car. Give him a call.
Charles