10 points for effort Matt, well it gives it an interesting look but I am not sure the authorities will like it.
 
There was a good wright up on the forum on how to do this mod that may have helped you.
 
https://www.mr2australia.com/mr2play/tm.aspx?m=104186
 

Oh really, ok never mind. Maybe you may have to give him a couple of tips Rob ;-)

Good work getting it fixed 😊

Hoonsy
 
 
Good job soldiering through the frustration and getting it done. I swear MR2s should of looked like this from factory

 
… but some of them did!!

5SGTE
They did?

Weren't some JDM cars wired up that way? 

Dudeman

5SGTE
They did?

Weren't some JDM cars wired up that way? 

Not sure. I thought the only way to get quad tails was to either modify a Gen3 harness by making a few loops, or by using the Gen2 harness which used dual filaments anyway for the Gen2 lights
 
Not entirely sure as I never looked into it much. Tried it once with my Gen3 Bathurst and threw in the towel after 30minutes of confusing eBay socket wiring..

Nik_Lee
 10 points for effort Matt, well it gives it an interesting look but I am not sure the authorities will like it.
 
There was a good wright up on the forum on how to do this mod that may have helped you.
 
https://www.mr2australia.com/mr2play/tm.aspx?m=104186
 

Before I did the quad tail light mod on my car I checked and found they should be legal, in Victoria anyway.

Well this escalated haha. Few things in response:
1. Yes eBay sockets are crap and this was largely the cause of my problems however you can't wire the stock ones to fit as they only have two wires coming from them (unless of course you get Gen 3 loom but you wouldn't mod as thats quad already).
2. Yep there is a loom around that gives you the quads, I think gen2 and upwards JDM had it and Gen3 upwards from Aus had it. Fun fact, the Aus quads have all 4 as brake lights but only the two outers as tail lights. 
It's much easier to just buy $10 worth of gear and do what other have done than chase a harness down though. 
3. The Gen1 loom that I have did have dual filament sockets, used so the lights would go super bright under braking, but they didn't utilise the low brightness feature of a dual filament globe.
4. If you're doing the mod never use stock sockets as they only have 2 wires (earth and positive) so you won't be able to make the circuit without extensive hacking and modification. It's much easier to use the crappy sockets but get the wires worked out before you start the procedure and use a multimeter to check there is resistance in the wires.
5. Of course the quads are legal in all states and territories that the MR2 was sold in. Like Dudeman said its brake lights test and then tail lights test and both passes.