@Gordon Nichols - I'm guessing that with the title of "An Overview of Rare Early Porsche Road Rims" maybe a second article covering later wheels was planned? Other than that, I got nothin'. There are multiple part #'s for some of the 16" widths but don't know anything other than early/late. What constitutes an early or late 16x 6, 7, or 8" wheel- I have no idea. I do know they look enough alike that without looking at the part # they are pretty much indistinguishable (that was surprisingly hard to type out!). The only thing I can think of is that maybe as the cars got heavier they used a slightly heavier slug so the wheels would be stronger? A car manufacturer normally doesn't change part #'s unless something has changed- it doesn't make sense for there to be multiple #'s for the same part. But all this is pure conjecture. It would be interesting to compare and weigh an early and late same width wheel. Does anybody know what year 16" Fuchs started showing up on 911's? 1977? '78? Again, I'm just guessing.
PS- there is a good thread with a lot of info on 15" Fuchs in the "Custom Wheel/Tire" forum on the Samba (it's easy to find as it's a sticky at the top of the page). At 23 pages, lots of adolescent drooling/idolizing over the early "heart" wheels, but my buddy Bruce mentions me on the last page, so a totally worthwhile read! There's just not the same interest in the 16" wheels with the VW crowd, though.
@WOLFGANG- I'm not surprised the Pedrinis (as you mentioned, Italian, and cast) are heavier than the 2 L Fuchs (which, of course, are forged), but if you'd asked me specifically I wouldn't necessarily have put it together, so thanks for the information. Both are very cool wheels as well. The "Performance/Engines/Transmissions" forum moderator (Glenn) on the Samba has a red '73 or '74 bug with Pedrinis- it's a great looking car.