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 Clutch Hydraulics, TR250-TR6 from $15.00 138247 $7.50 GI64473143 $10.50 Caliper Rebuilding TR3 thru TR6, GT6 from $2.00