It looks like you received TR3 master cylinders instead of TR4. If you look
at the Moss online catalog they have good drawings that should help
identifying them and check the numbers also. If they are TR3, there are
rebuild kits available. The fluid reservoir piping al a TR3 is shown as
well, since it supplies both in parallel it should serve your plan if there
is sufficient room under your bonnet - I think the overall height is greater
than the TR4 master cylinder.
Keep in mind that having two masters won't be safer unless you are isolating
the hydraulics [dual circuit piping]. Maybe someone else on the list can
explain how that can be done in practice. Brake pedal force should be
calculated as well. If you are doubling the area of the master cylinder
pistons, you will need double the force to get the same force in the
calipers and wheel cylinders as you did originally.
Glenn C
1959 TR3A TS31684L [in total frame up restoration]
1960 TR3A TS64803L [driving, but needs work]
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