Triumph 725370 TR5 TR6 Air Distribution "AIR-PULL 1-DEFROST 2-CAR" Black Knob
Note there fits on to the standard Lucas 1/4" hexagonal shaft with spring loaded retaining plunger. Knob head size 29.2mm x 29.2mm, Knob depth (27.3mm). As fitted to Triumph TR5, TR6 CP/CC. Alternative knob for Triumph TR250 and TR6 CR/CF.