Found this buried back in a 2004 post....
in the order: seat, floor upholstery, dash, roof lining
YA = black, black, black, grey (I have this)
YL = grey, black, black, grey
YG = grey, grey, black+grey, grey (I've seen plenty of these on the forum)
YC = beige, beige, dark beige+beige, beige (plenty of those too)
YH = blue, black, black, grey (and matching arm rest in blue in the door)
YJ = yellow, black, black, grey
YK = red, black, black, grey
QE = black black black black (only on the Dutch S-line model (so probably leather too))