I just bought 17" replica Monoblocks for my 420 sel. Amazing improvement in handleing with no cost to ride quality. My only concern is that they look so damn good someone will take them! I know that I my bolts are Ball Seated and measure M12 x 1.5 but when I've looked up locks online I've found two different specs:

M12 x 1.5 x 39mm Ball Seat
M12 x 1.5 x 28.2mm Ball Seat

Which one do I want??

thanks!

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1988 420SEL 170K

what is the usable length of the lugs you have now ???? that's what the 39/28.2 number is referring to

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