Vanne, I know of several tracked cars (several years) that have the STB and no under plate.
None of them have the stress fracture issue.
In general it's far less common on our chassis than some other BMWs
That said, it never hurts to have that little bit of extra protection.
I have a set that I don't have installed at the moment and am debating wether I will put them back in.
Part of my issue is the top nut on the damper shaft.
If I put the plate back in the nut will line up with the lip of the strut tower opening. =less camber adjustment.
If you have no such clearance issues, I would add the under plates.
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'21 M2C Hockenheim Silver
'18 718 Cayman S Lava Orange (sold)
'13 E92 M3 Santorini Blue (sold)
'07 Z4 M Coupe Alpine White (sold)
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