Barton plain bearing genoa cars and sliders. Towable genoa car 2:1 purchase. A lightweight and compact range of plain bearing extruded aluminium sliders, running on 20mm (_Ó) T track and manufactured from high quality marine grade aluminium with our unique grey anodised finish for added protection. This useful range will find a wide variety of applications on larger dinghies, dayboats and light cruiser/racers.