Sonnax turbine-side stator cap AL-WA-4 adapts Sonnax performance converter kits [AL-RK-1] and [AL-RK-2] for use in any Allison® 1000/2000/2400, '08-later unit that has a turbine-side stator cap and bearing race stack up height of .513". 2008-Later converters with a turbine-side stator cap and bearing race stack up height of .482" can be adapted to Sonnax [AL-RK-1] and [AL-RK-2] with stator cap AL-WA-3.