I have a used 3-piece ducktail spoiler for an old Datsun Z. Not sure of brand, but it seems to be very good quality, fairly heavy and robust. Would be fine for a rat/challenge car, or strip it down and refinish it for a tidier application. Pulled from a junkyard, should fit the first-generation (S30) 240/260/280.
Looking for around $175. Will consider trades for old Mercedes or Saab parts, tools, Nikon equipment, etc. Make me an offer!