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YOUR RESEARCHExtended wheel bolts size?
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Use but prefer the oem swivel type washers
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I've used both but prefer the oem swivel type washers.
Leading evidence: 'Use but prefer the oem swivel type washers' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run stock wheels' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
I hear this is the best looking setup when running stock wheels.
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Suggestion
On a side note, possibly aftermarket or even oem 'optional wheels' might use a different length lug bolt..?
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Suggestion
Porsche uses oem lug bolts with swivel ball washers.
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You can add 7mm & 15mm to the lenght size of your existing bolts (I believe they are 45mm) and come up with sizes that will meet your needs. As far as where to source them, there are several options available including H&R:
https://www.pelicanparts.com/catalog...SUSPRF_pg3.htm
53mm minus 45mm is 8mm... so those will only work for your 7mm spacer. You need 60mm shanks (45mm OEM shank + 15mm spacer = 60mm shank) for the 15mm spacer.
Just went thru this. Porsche uses oem lug bolts with swivel ball washers. Or some call them floating washers, but total shank only length is what we are concerned with.
Its 28mm from ball washer to end of threads.
Less expensive wheel lugs don't have the thick swivel ball washers, just a ball seat. Some after market ball swivel washer lug bolts have a much longer 'swivel washer' than oem. So total length will differ. I've used both but prefer the oem swivel type washers.
So as others have said, just add in the spacer size + 28mm. But make sure what you buy is denoted as shank length after the washer, not total length...
On a side note, possibly aftermarket or even oem 'optional wheels' might use a different length lug bolt..? but 28mm lug is oem stock wheel size for 996.2 & 996.1.
My 2003 C2 with M030 suspension has factory 5mm spacers (I think 5mm) on the rear. The factory ball seat washers are color coded for the longer factory bolts. One set is red, the other silver.
So, yes, depends on factory options as to what you should have. And if optional or aftermarket wheels, then all bets are off as to what you need/currently have.
-Tom
