All these Tektro disc brake I.S mounts will suit an I.S. Mount frame or fork with Post Mount caliper. L1 Adapter - suitable for Lyra: Mounts a Post Mount caliper onto a front fork with 140mm rotor only. Adapter and caliper mounting bolts included. L2 Adapter - suitable for Lyra: Mounts a Post Mount caliper onto a front fork with a 160mm rotor or rear brake with a 140mm rotor. Adapter and caliper mounting bolts included. L3 Adapter - suitable for Lyra: Mounts a Post Mount caliper onto a front fork with a 180 rotor or rear brake with a 160mm rotor Adapter and caliper mounting bolts included. A2 Adapter - suitable for Aquila, Moto, Draco, Auriga and More: Mounts a Post Mount caliper onto a front fork with a 160mm rotor or rear brake with a 140mm rotor. Adapter and caliper mounting bolts included. A3 Adapter - suitable for Aquila, Moto, Draco, Auriga and More: Mounts a Post Mount caliper onto a front fork with a 180 rotor or rear brake with a 160mm rotor. Adapter and caliper mounting bolts included. A5 Adapter - suitable for Aquila, Moto, Draco, Auriga and More: Mounts a Post Mount caliper onto a front fork with a 203 rotor or rear brake with a 180mm rotor. Adapter and caliper mounting bolts included. I2 Adapter - suitable for iO: Mounts a Post Mount caliper onto a front fork with a 180 rotor or rear brake with a 160mm rotor. Adapter and caliper mounting bolts included. I3 Adapter - suitable for iO: Mounts a Post Mount caliper onto a front fork with a 203 rotor or rear brake with a 180mm rotor. Adapter and caliper mounting bolts included. D1 Adapter - suitable for Manitou Dorado fork: Mounts a Post Mount caliper onto a Dorado fork with a 180 rotor or rear brake with a 160mm rotor. Adapter and caliper mounting bolts included.