Sunbeam wheel cylinders

[olihofmann]

What is the right diameter for the rear wheel cylinders on a Sunbeam Alpine?
Thanks for any infos
Oli

[droopsnoot]

This site suggests they are 3/4" bore on a Series III: http://www.mevspares.co.uk/REAR-BRAKE-WHEEL-CYLIND...

There may be other variations.

[Ubendum]

A lot depends on the year and generation of Alpine. Several different ones were used, in at least two different diameters. 3/4" and 7/8" come to mind, but I think that there may have been others.