The GKTECH 240sx dual caliper bracket allows the use of a Wilwood 120-10188 caliper in conjunction with an OEM 240sx rotor/caliper combo for use as a standalone hydraulic E-brake . It is super simple to install with the only modification being to the standard dust cover. Vehicle Compatibility: - Nissan S13 240sx - Nissan S13 Silvia - Nissan S14 240sx - Nissan S15 Silvia - Nissan A31 Cefiro NOTE: designed to be used with USDM or JDM S-chassis 9mm rear rotors and will NOT work with Skyline/Z32 rotors and will NOT fit with European S-chassis' calipers/rotors NOTE #2: The Wilwood calipers have a mounting hole of 3/8inch (9.52mm) and the studs used on our brackets are 10mm and as such the 2 mounting holes need to be drilled out on the calipers to 10mm. This is very much a DIY kit and is easy to do. NOTE#3: The brackets themselves will NOT fit the Gktech rear drop knuckle