Founding Member #2
Join Date: Jun 2006
Location: Orange County, CA
Vehicle: 2008 SLK 55
Mentioned: 81 Post(s)
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For the R171: The OEM bolt for the SLK is a 12mmx1.5 thread pitch with a 39mm shank but it also has a R12 ball seat not a cone seat.
Another link: https://www.slkworld.com/125954-post2.html
Like what others have stated, make sure they conform to OEM specifications in terms of strength and metallurgy.
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Pewter(cubanitsilber metallic)/Beige, PIII package, Airscarf, Hands-Free Communication System, Lighting package; Designo Black Leather Cover on e-brake handle(Thank you Bill T), SmartTop v3.x, John's 3BFM, M113 AMG OEM air filters, Modified R170 ant., clear side-markers & front parking lamps w/error-free LEDs, chromed front & rear turn indicator lamps, steel mesh at battery bay cover & cabin air intake, sock-over-seatbelt buckles, belt-loop guide protectors, Lamin-X fog lamp protectors, bilateral rear fog lamps enabled, AMG crest on gear shift knob