^if you are going off the shelf hardware get them case hardened.
Yes, you want them as close to the same size as possible but its not a huge deal because you can still fine tune at the tower slots.
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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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