The main servo assembly incorperating a master cylinder at either end measures 400mm
long x 200mm across the largest part of the body.

 

If you are contemplating using this kit on a car other than a TR, the following will be helpful: -

Our dual Servo kit works very effectively on TR2-6 and other cars with front disc brakes and rear discs/drums of a range below and above TR equipment, that being 11"(9280mm) front discs and 9-10"(229mm-254mm) rear drums/10-1/4"(260mm) discs when using our rear disc brake conversion.