I hve the cossie servo trial mounted on a mk4 firewall and it at least frees up space as there is no traditional vacuum drum included. I don't know how much space you require and how well this is suited to a LHD car.
I could take a measurement for you, if I knew what to measure.
As a bonus, it's a superior servo that works always equally and not depending on the throttle position (amount of vacuum).
Remote servos are of course another standard way of solving this kind of issues and have been used for ages even as standard fitment.