this is the 1 i have, and my horn button works, http://www.rhdjapan.com/boss-kit-hub-adapter-toyota-18721 but you have to buy this horn just for the sexualness of it http://www.rhdjapan.com/hkb-sports-origina...ld-silver-58282 and because i have the same but in black and it definitely works, just fit the boss kit and then plug the wire into the horn it doesnt wrap around anything because of the metal plate that connects on the back of the boss this TRD 1 will work alos as it only has 1 connector on the back http://www.rhdjapan.com/trd-steering-wheel...ton-black-18856