Hey guys, after months of waiting I finally got Bridgestone RE003 tyres for my gtst wheels, now I want to put them on the car but not sure what lug nuts I need to make it work? Many people have told me the stock ones will not fit the Nissan wheels. Thanks

I used Muteki 41886B 12mm x 1.5mm closed-end type,  from Amazon;
http://www.amazon.com/Muteki-41886B-Black-Closed-Spline/dp/B004QHR36C
 

xez I used Muteki 41886B 12mm x 1.5mm closed-end type,  from Amazon;
http://www.amazon.com/Muteki-41886B-Black-Closed-Spline/dp/B004QHR36C

 
I'll second that. When I ran R32 rims, I used those too.
 
Just out of interest, what sizes did you get in the RE003's? I didn't think they had one available with the correct profile for the rear that kept the rolling diameter in the right range?

"Many people have told me the stock ones will not fit the Nissan wheels." 
Correct. 
 
The pic shows the type you need on the left that have a 60 degree taper to fit your Nissan wheels.
The stock Toyota type are shown on the right, don't use those!!
 
If you just want to use a stock socket to tighten, get the hex head ones.
As already mentioned, the thread to get is 12mm X 1.5
They are available everywhere, and best to get them with a closed end to keep out rust.
 
IMPORTANT!! Do not use grease on the threads, and be sure to tighten them in a star pattern, finishing with a tension wrench to be sure they are even.   FWIW, I use 80 ft/lbs on mine.
 

I ordered 205/45 all round and after months of waiting they only ordered two tyres, so I had to reorder but they had no more in Australia so ended up with MY02 for the back set, the guy said tyre rotation won't matter though even though different tyres

And just wondering, I rattle gunned the Toyota lug nuts in then did extra tightening by hand just to see them on the car and went for a little drive, how bad is it to use Toyota ones? And if I wanted to cruise some curvy roads tonight would it be safe enough?

Where did you get your tyre advice? Sounds like you've been seriously misled by someone.
 
You shouldn't be running 205/45 on the rear of an SW20 at all. The car is designed to have a staggered tyre set-up with 195's (as standard) or 205's (very commonly) on the front and 225's on the rear.
 
Whatever you run, the rolling diameter also needs to be within 20mm of the standard factory setup specification (in NSW at least) if you want to be legal. You can find the standard tyre specs for your car's year by looking on Carsales at an MR2 listing for the same year.
 
Any tyre place that told you that running the wrong (and smaller) size on the rear should be soundly spanked.
 
You should also be running CORRECTLY FITTING wheels nuts AND concentric hubrings with the R32 rims, so that you rims are correctly located on the hubs. These are the correct size rings for R32 Skyline rims:
 
http://www.ebay.com.au/itm/Hub-Centric-Rings-OD-66-1mm-ID-60-1mm-Aluminium-Alloy-/181530974280?hash=item2a4416d848:m:m_-Z5NRD1xvoGclE8ZNoKOw
 
I wouldn't be driving around any curvy roads until you have all that sorted out. You could break your wheel studs, end up with wobbly wheels… or much worse.
 
Don't compromise on safety when it comes to wheels and tyres. It just isn't worth risking your life for – or anyone else's! Also, if you have a crash, your insurance company will not cover you with the wrong size wheels and tyres.
 

To save you the bother of checking, if you're running 16" R32 rims, you should be be running either 205/45/16 (or 205/50/16)  tyres on the front, and 225/45/16 on the rear.  This gives you the correct rolling diameter to legally match the factory specifications (in NSW).
 
Many people run bigger rims and wider tyres of course, but running a smaller width than stock on the rear is a real no-no.
 
EDIT: Sorry… I forgot that early SW20's came with 195/60/14 fronts and 205/60/14 rears, so you can run 205's on the back! (If you have an early model).
 
Probably would still have been better off keeping the sizes staggered, but… that's not such a drama.
 
You should still have correct wheel nuts and hubrings on though!  

When I ran GTR wheels all arround, I bought some tapered wheel nuts like those previously mentioned. 

I also bought a set of Hubcentric rings to keep the weight off the studs. They only cost $60 on ebay and they are well worth the investment 
 
I was running a 205/45/16 and a 225/45/16. The speedo was accurate. The only reason I changed was the limited and expensive tyre selection

okay thanks guys, it was bridgestone telling me this so I'm not sure what to do now, don't think they would exchange tyres as ive driven a bit on them now so might try and buy another two the correct size and have two spare tyres for the front, the speedo seems okay for running 205/45 at the moment but ill take youre advice, I have ordered both new nuts and hubcentric rings