I worked in the distant past for AP products {Lockheed, Borg and Beck] so not overly familiar with Girling . From what I remember the master cylinder number is only relevant for the first 8 digits ie 64678912. The Lockheed servo you could dismantle in that the two halfs locked together with a quarter turn, easy with the correct tools but possible with some ingenuity. I'm sure someone on the Owners club forum when looking for an alternative [similair problem] found a more modern set up that required little work to fit. Maybe off a Renault. Will see if I can find the details.
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