Hi George,
If what you are showing as a new part box from Porsche on right is the replacement for your caps and Marks caps, you are right and they are not the same. If so we cannot trust parts from Porsche in less they are NOS. I do not have a problem with the new parts except if they are trying to be sold as what came on the cars back in the 70s. I get that your save box is the 70s control box.
Lots of work to get just the right part with the right finishes. Most people to not see it but 25% of the people do.
I am showing my cap stash from today and I sent my 76 car to Belgium with fresh Mark caps but had dicked with these caps for the last 8 years. I bought caps from ISP
as well and you can see there logo inside of those caps.
None of these are steel parts that where formed by I guess pressing. All where Aluminum that where machined for billet stock. IPS where different sizes and none of them would fit on the front of my 76. Back was tight but OK if you did not screw them up with a mallet.
The factory that made the caps back in the 70s must of trashed there tooling and no one wants to invest in it over for caps. You are right, too many players reinventing the wheel.
I guess there is a reason that some one with a show car would pay $800 for steel perfect ones.
Bob B
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