Thanks Alan, useful info. I looked at their website.
I replaced them in 1994 when I restored my car 1st time, they didn't last. Can't recall where I bought them from.
I was thinking about finding a foam or rubber material and forming a ring (donught) shape for the motors to sit on. This would insulate them from vibration and form a seal so they wouldn't suck in any foul air from the engine bay.