Help - Can anyone identify my Master Cylinders?

[rpmathis]

I'm thinking my master cylinders are not original. They mount to the plywood floor only. They appear to be designed so they can be mounted on top of the floor and actuated directly or mounted below to floor and connected though pull rods to the existing heel brakes. Can anyone identify what master cylinders these are?

I'm having issues with them and need to identify what they are to even get started. For one my plywood floor is flexing. I can't keep them full and think they are supposed be used with a separate reservoir to keep them full. They are on the 65 7ECA listed below.

Many Thanks!
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[rpmathis]

It appears I have Scott B-711 Master Cylinders which were used on some Pipers. They are still available. Has anyone seen these used on a Citabria? No 337 was filed, assuming this is a modification. What should I do?
If I keep them I'm going to have to strengthen the floor.
Any help appreciated!