Shop › 148870 Image 1 of 1 148870 $42.50 Gearshift knob. US spec TR6. Will fit any TR4, TR4A, TR250 or TR6. Add To Cart Added! Gearshift knob. US spec TR6. Will fit any TR4, TR4A, TR250 or TR6. You Might Also Like Gearbox and Prop Shaft Covers, TR4-TR6 from $0.15 131339 $55.00 58391 $85.00 Shift Boots, TR4-TR6 from $10.00 Engine & Transmission Mounts, TR250-TR6 from $9.00