with suspension arm axis: 20mm, steering tube: 34mm, steering lock: slotProduct descriptionFor Vespa P150X/P150-200E/Lusso 1 On the last ‘PX old’ and the first Lusso models, a ‘hybrid’ steering column was used. This has the steering lock attachment and steering shaft diameter of the previous steering columns, but left the factory with an axial diameter of 20mm. Owners of 1983 models should therefore check exactly which steering columns they are using prior to order. Either measure it on the scooter or compare the chassis number in our shop. -TIP: All steering columns are all supplied without headset bearing sets. The correct tool for removing the bearing shell is set out in the Tools topic. OEM numbers (for comparisons):178050 (PIAGGIO)