You gotta look what year the headunit is from. Not all years are compatible. Best way to check this is look to see if the connectors on the back are the same as yours. If they are, I'd say its a safe bet that it'll work. You could always plug it in and see if it works before you buy (if you have that option).
scENFORCER - 1999 SC400
LSD / PPE / Tanabe / Carbing / BFI / Megan / TMS / Dazien / Volk