Hey Ron
I have a load of them in stock here: http://www.ebay.co.uk/itm/Nissan-350Z-Seat-Belt-Complete-Assembly-Offside-Right-Driver-UK-COUPE-CARS-/281937680441?ssPageName=STRK:MESE:IT
They all work fine, but it's hard to find one that still re-tracts strongly like when they were new. By 10 years old, most of them are pretty much the same from my experience.
Thanks