To fit the following Gas Gas models with a four piston GALFER caliper:- 125/200/249/270/280/321 TXT 99-03 Front and Rear, 50/80 TXT 01-02 Front and Rear, 50 EC Rookie 01-02 Rear, 50 EC Boy 01 Front and Rear, TXT Boy 50/280 01 Front and Rear, EC Boy 50 01 Front and Rear, EC 50 (Boy) 01-04 Front and Rear, EC 50 (Rookie) 01-04 Rear, TXT 50 (Boy) 01 Front and Rear, TXT 50/80 (Rookie) 02-03 Front and Rear, SM 50 (Rookie) 01-04 Rear, Pampera 125/250/280 04 Rear, SM 50 Rookie 01-02 Rear, Pampera 250 02-03 Rear