Description Air box rubber hose to fit 250cc Alpina models with an Amal Mk2 carb Fits models 165/187/212 Carb side inner diameter 51mm Bultaco part number #155.15.166 If you need this type of hose to fit a late 250cc Alpina (1976 onwards ) fitted with a Mikuni carb you will need this hose- HERE
