I'm installing H&R Spacers on my X5: 25mm in the rear and 10mm in the front. For the 10mm spacers, can I use the same lug bolts or do I still need longer ones? I've read that X5 lug bolts have 50mm of thread. Therefore with a 10mm spacer I would lose 20% of the thread and therefore 20% of the strength. Is still this within the margin of safety built into the design and acceptable with regards to safety?

Thanks in advance....

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'06 X5 4.4i w/Sterling Gray/Black Dakota Leather, Premium, Sports, Cold Weather, Rear Climate, Heated Steering, Nav, CD Changer w/MP3, Escort Passport 9500ix, BMW Valve Stem Covers, Aluminum Running Boards w/Flared Wheel Arches, AUX Input, Hood Protector, Titanium Grill/Hood Vents & Titanium Rings on Inst. Cluster, Decorative Front Skid Plate, AC Schnitzer pedals/shift knob, Rear Bumper Protector, Chrome Exhaust Tips, '20 Vredestein Ultrac Tires on Style 214's