I just bought a full set (2 amber fronts, 2 red rears) of NOS Side Marker Lights on eBay for 22$usd (brand new, with Wires, harness and bulbs). Best purchase i ever made, Now, i wont sell mine, but im sure if you watch ebay you can find some.

.Creator

 

infact, heres a set of mildly roughed up ones for cheap
http://cgi.ebay.com/ebaymotors/ws/eB...tem=1871608450
and they even have the stock connectors still attached.
Even though these say "280zx" They should be the identical lights for all 240-260-280z(x) its just the year thats stamped on them that will be different.

 

The 240Z-280Z lights have a chrome trim around them and are slightly different than a 280zx's market lights although they will bolt in if you wish to use them.
If you are wanting the front right corner light/turn signal assembly, then that is something totally different. Those are unique to the 240Z. I sold a pair of used ones on eBay a while back and I think I got $55 for the pair.