QUOTE(Eric_Shea @ Sep 11 2006, 09:23 AM)
Fact is, the early Porsche ones are 18mm and the later ones were 20mm. You can get under body 18mm factory bars for $20 on up. Choose wisely.
i ran the stock underbody bar from a '84 carrera for a quite some time while i was saving money for my tarett bar ...
interestingly enough, that 911 underbody bar measured 21mm ...
Andy
PS: it worked fine, better than *no* sway bar for sure. only real drawback is that they're not adjustable ...