This is also not listed as 1000, so here it is incase it gets missed by one of us that needs it.
 
One side only.
http://www.ebay.com.au/itm/Datsun-Pickup-521-Front-Fender-Marker-Lamp-Assy-NOS-/150830865238?_trksid=p3286.m7&_trkparms=algo%3DLVI%26itu%3DUCI%26otn%3D4%26po%3DLVI%26ps%3D63%26clkid%3D8951249890905842132
 
Both sides.
http://www.ebay.com.au/itm/DATSUN-1600-BLUEBIRD-510-SSS-JDM-NOS-FRONT-GUARD-INDICATOR-LIGHTS-521-/390424592451?pt=AU_Car_Parts_Accessories&hash=item5ae71e8043
 
These show up fairly regularly on ebay as a datsun 521 part, I think this will be the last one of these spotted on ebay posts i'll throw up on here as im sure most of us know the interchangability of these parts by now.