The curved in kick start assembly fits 4 speed models as follows. Sherpa S serial number split 301308 and up. Also some Metralla 200 serial number split is 804795 and up, The Matador 200 serial number split 401241 and up. The Mercurio 175 serial number split 920956 and up. The rest of these models did not have a serial number split, Mercurio 200, Lobito STD and AK models, Campera 175, Matador MK2 250, Sherpa T 250 and Pursang MK1 250.