Shop › GISP2102 Image 1 of 1 GISP2102 $12.50 Master cylinder repair kit, .70” bore. TRW brand. For clutch master cylinder on TR4-TR4A-TR6 (1970-76). Add To Cart Added! Master cylinder repair kit, .70” bore. TRW brand. For clutch master cylinder on TR4-TR4A-TR6 (1970-76). You Might Also Like Pipe and Hose Clips from $1.50 Rear Brakes, TR3A(Later)-TR4-TR4A-TR250-TR6 from $1.25 GIGHP13 $15.00 Clutch Mechanicals, TR4A-TR250-TR6 from $3.50 Brake Pads & Rotors, TR4(Later)-TR4A-TR250-TR6 from $0.25