Are they legal? Can you use them with stock wheels to provide a little more 'stance' than stock. Any other tech reason why you wouldn't use them ? ( I have rolled guards already) If yes for above - where would you get some from? Thank You
Not legal, yes you can use them but be sure to get hub-centric, bolt-on spacers. This basically means the spacers are centered to the hub (for balance) and bolt up with their own wheel studs protruding, so no dealing with shortened studs. Adaptec make very well acclaimed bolt-on spacers to specific specs. I've got a set on my TT to fit wheels designed for BMW's (5x120). They machined them to my exact specs and provided an excellent product. https://www.motorsport-tech.com/wheel_adapters.html
They can be "Legal" in some instances, however the real issue surrounding illegality is the stupidly dangerous practice of fitting them in conjunction with massively oversized Tyre/Rim combinations which hugely increase the risk of collapsed wheel bearings and/or broken stub-axles/loss of wheels(and the subsequent likelihood of serious accidents in such circumstances). There is a huge variance in what some people consider "sensible applications).
I have stern 17's with 245 front and 265 rear with reasonable offsets .. the stock wheels that came with the car were skyline 16's with 225s all round I put them back on the other week for testing but they did not 'fill the guards' and basically looked a bit lame .. sort of thought they would look better if they were set out a little more .. Anyway thanks for your advice all