URAS kit's are for Imports only, as the reo's are different.
R31 house are stupidly expensive, but exceptional qualty. I have an R31 house Version 5 front lip on my car right now, With CCS sideskirts and rear skirt.
There are lots of Hard to find jap kits available, But here in Aus there's GS Motorbodies, CCS, the Factory SVD kits, plus a few more obscure ones.
Some kits from other models can be fitted, ie. ATM Im looking at removing my CCS sideskirts and putting on either A31 cefiro URAS or R32 4 door Final Konnexion sideskirts...... and either a genuine R31 coupe URAS rear bar, or a modded A31 rear bar.
Check out the links over @ www.r31skylineclub.com, and you'll find plenty of pics and info....