Original BMW lug bolts are 25mm. The following bolts are required for adequate thread penetration when using spacers. Make sure to order the required number of bolts for your vehicle. We recommend the following sizes when using spacers: 5mm and 8mm spacer - 35mm extended lug bolt, 15mm spacer - 45mm extended lug bolt, 20mm spacer - 50mm extended lug bolt, and with 25mm spacers the stock lug bolts are recommended.