With the comments on the "kremer de 1970" post, I have resumed the investigation on my car 576 regarding the installation of roll bars, as mentioned by the second owner of this vehicle. I noticed back then that there were no welding marks in that location indicating the presence of a plate for the cage support. However, there were holes, two on each side of the vehicle, corresponding to the location where these cages would go.
Given this, I set it aside and continued working on other things with the vehicle... In recent days, I wanted to examine the area more thoroughly because it seems strange to me that someone would buy roll bars and "attach them improperly" to the vehicle. I researched the screws used for these bars (information present in numerous posts on this forum), so I tried using an M8 screw in those holes. They screw in; the size and thread match, making it a bit more peculiar.
Based on this, I begin to inspect the area more closely to try to see if the hole is indeed threaded (something unusual as I understand that threading something there is a weak point unless it has its respective reinforcement). Looking at the image, I try to distinguish whether what I see is the "thread" or another plate in that location. I am unaware of the thickness of the metal sheet in that spot; I must understand that it would be this entire panel:
So, I would like to know if anyone knows the thickness of this panel or would be able to discern if in these images, the "thickness" is apparent or in line with the normal thickness of this panel.
Also, these "pieces" are present, and I'm unsure if they were used to anchor the bars at some point. I believe I've seen something similar in some photos on this forum, on a "Kremer" vehicle.
example no kremer:
https://www.early911sregistry.org/forums/showthread.php?106860-1971-911-S-east-african-safari-race-car-discovered-in-Germany
On the other hand, I would like to inquire about the types of anchor points for roll bars. I'm already familiar with the "official" ones, but I would like to know (as in the case of Matter) how bars were anchored in those locations if the "Porsche hoop mounting plate" was not available. Has anyone ever seen any work from the inside of the piece?
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