The blenders are compatible with any Chef or Major which was manufactured from around 1976, although they will not fit the A701 or A707 models. The A901/ A907 models are compatible. Your model number can be found on the underside of your Chef or Major.
AT358– ThermoResistTM Glass (Heatproof)

The blender has a 1.5 litre working capacity for cold ingredients and a 1.2 litre capacity for hot ingredients.