U bolts will tighten until they shear, because they streeeetch.

The size changed after 2005. 'Off the top' from 7/16 diam to half inch, but I might be 1/16 too big, so..... Could have been 3/8 to 7/16ths.


DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4