Think Alex does the for £5 each
On another vein, I bought these http://www.ebay.co.uk/itm/220799857438?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 which conform (as far as I can tell) to the callipers on a 350, 370 may be slightly different, or maybe not so maybe do a quick but of research.
I cant believe what Nissan charge for some parts, I thought Toyota were bad...
EDIT: just seen, you have a 2003 GT pack which means you have a 350, not a 370, but this topic is in the 370 section