Various applications : Serie 1 80" "and Minerva : front left brake cylinder. The diameter of the entrance hole for the pipe is smaller than that of the original cylinder. Must therefore mount it with either an adapter - reducer (reference 139082) or with the brake hose (SF-219824) specially designed for installation. Caution before ordering! Measuring the diameter of the hose entry hole in your brake cylinder. If the diameter of the hole input for the tip is X mm, the brake cylinder is still the original. So you have to order one brake cylinder + 1x 1x 139082 or SF-219824. If the diameter of the entrance hole the pipe is x mm, the brake cylinder is no longer the original model, so you only have to order the cylinder (no need to order extra 139082 or 1x 1x SF-219824). Serie 1 86"-88": brake cylinder front left. Serie 2 88"and 3 Series 88" until 1980: brake cylinder front left. Serie 3 88" after 1980 (model with 2 brake cylinders by wheel on the front axle): rear left brake cylinder. Serie 2-3 109 "": rear left brake cylinder.