http://www.ebay.com.au/itm/DATSUN-SKYLINE-GTR-510-180K-240K-KGC10-PC10-SEMI-SEALED-BEAM-H4-SOCKET-FRAME-SET-/160901629093?pt=Motors_Car_Truck_Parts_Accessories&hash=item25767c04a5

So those lights in Uras's post plus wired in relays would be the way to go?

Unfortunately, the relay setups you can get are only for the 240Z, (and maybe the 260Z?) because you cannot get the headlamp connectors for the 280Z. I'm pretty sure they are the AMP brand, but the model/syle# is a mystery.

The best thing I did so far on the '78 was a new set of lamps, and to go through all the associated connections with DeOxit, annually, or more often. I considered a set of the asian made lamp housings with the replaceable bulbs, but even those are hard to decipher.