I bought a set of 15mm and 12mm spacers for the front and rear respectively. I had my shop (very reputable and experienced with Euro to Italian exotics) put on the spacers for me as a favour. They informed me that both the 15mm and 12mm spacers came with the same length lug bolts. He stated that he got 6 full turns of the lug for the 12mm spacer, which is safe, but only 5 full turns of the lug bolt for the front with 15mm spacers. He stated that it is not recommended and not very safe.
Please advise, whether I got the wrong set of lug bolts or Macht Schnell has tested that to be a safe length lug bolt for 15mm spacers in the front