I have a few tubes with missing chassis and I would like to know which chassis' can be used for these tubes.
The first one is an ITT A51-211X. It came with a MTC 90 chassis, which has passed away.

I would like to use a more modern chassis.
The second one is Philips A51-590X
The third and last one is a Samsung 5130 B22.
Any info about matching chassis models would be great.