Heres a few pics of my ute finally at the panel beaters after 4 yrs sitting in garage in primer! One thing I highly recommend if your going to get panel work done is make sure they don't shaft you! I had already had body done and as you can see by pics they bogged over everything! I'm just lucky a mate is doing it now and basically is remaking each side at back! Left is how it was right is nearly finished but now need tail lights to finish.

I think maybe Mazda 1000.... What do you think? They are available brand new, with a few mods I think will be ok!

I would stay away from those lights they dont suit the angular hard lines of the 1000 like they do on the Mazda and also Mazda peeps will laugh that we are only left with their stock path our cars with.
 
I would seriously look at more gothic or period cathedral like versions there are two Chevy Nova ones that you can choose eg. Angular which you can add an indicator on the reverse clear section thats part of the bottom or use these rectangular ones but will need a small round separate indicator maybe unless you can use the Mustang style of flashing which turns the red on and off or these rectangular (2) ones which can be fitted with flashers then with all of them you just fit a chrome reverse wired spot light below the bumpers like on early 70s Honda Civics or these very cheap ones in LED chrome in the same way below the bumper or tucked under tailgate line

put cadillac style ones in i reckon they'd look sweet

 Hi all, I think d is right! After heaps of searching I am almost convinced the 67 nova tail lights are the go. I'm going to claim them as a datsun item! They do look very trick, hope to have them ASAP for install.

Hi all, a few more pics, still on bloody driver side though! Found a bit of rust in sill which led to a bit more...awesome! Better to find it now I guess and repairs coming up good, panel beaters make it look so easy! I think there might also be an issue with nova tail light width as well, been told they are 120mm wide so might be back to searching! Damn they were nice! Anyway weekends here and so I can wear out my fingers searching the net.

Dats a real shame they are too wide 
 
 
Be nice if you knew someone that could make flat custom Nova ones
that are more narrow and longer from laser cut or waterjet cut stainless
steel then cut your own plastic lenses behind them and get the panel
beaters to make the housing from stainless to suit compact LED bulbs

or some like these but wont fit also maybe HQ ones do?
http://www.ebay.com.au/itm/Holden-HK-HT-HG-Ute-Wagon-taillights-/200921856168?lgeo=1&clk_rvr_id=477888343058&vectorid=229515

If your bodyman is as good as you say
Not sure on the dimensions you have to work with
How about some Pontiac Firebird stye turned on their edge ?
 
Heres some getting done on an ugly car (UC SUnbird)
 

I was going to suggest a similar setup using thin led lights you can use in both amber and red
however something with chrome would be nice lasercut to look like a shorter version of these
cheap led trailer lights

however original looks so good too!

 
click to enlarge