Bad bug,
If you are looking for Aluminum Arms, then none. All increase the track width to some degree.
I have read some discussions in this forum on the Porsche Steel Arms, which someone said were internally braced more than the stock Beetle arms, but I have no experience on this item.
I can tell you that the early Aluminum Arms increase the track width less than the late arms.
I recommend doing a search of the suspension forum and you will no doubt find more information than you need on this subject.
Cheers,
Doug
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