Pedalbox and handbrake cylinders.
OBP cylinders are also available separately. These fit OBP hydraulic handbrakes as well as the pedalboxes. Will also fit most Alcon based systems as well as several others since cylinder specs are usually similar.
The cylinders are available in .625, .7 and .75 inch sizes.
Brake cylinder specs
Fitting hole distance (M8, center to center): 57mm
Neck / fitting hole diameter: 35 mm
Length from fitting flange towards back: 107mm
Fitting outwards (to brakes) 3/8" UNF
Fitting in (from reservoir / other cylinder) 7/16" UNF