i would never fit cheap spacers to a car its not worth the risk... buy stuff that is designed properly and tested...
I have H&R 12mm spacers are R 1370 a pair and are TUV approved so you know they are safe
I also have H&R extended bolts at R48 each
also have H&R lock nuts caps at R 385 (pack of 4) these fit onto the bolt heads to make them harder to steal...