Will 19" LR3 wheels fit my 2001 Disco? Bolt pattern looks the same, anyone have the measurements? If LR3s use different lug nuts, could I still mount on my hub and use my old lug nuts?

 

I believe they are different. Your Disco uses a 5 on 120mm bolt pattern and I believe your lug nuts are larger.
Why are you wanting to run 19's on your Disco, they are the worst for off road.
Mike

 

I have after market 18's and the 255 55 R18 have fun finding some good all terrians i am now having to raise my disco 2in just to get a mud terrain on it 31 maxis mudders I would rather have my old 16's back better gas being the wheel and tire setup of the 18 weighed to much