Why not support our vendors, in the US or Roland in Hamburg? They have found and know exactly what length and strength are needed depending on whether you have rear wing. I hope that what you found fits your car, but it could be a lot of trial and error?
Sometimes we Pantera owners go out of our way to invent what has already been "invented" before. In Danish there's a term that translates to "crossing the river to get some water".
Just my $0.02
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