Thanks for the feedback.
Clamp is made from 6082 aluminium (20mm wide) and i plan to use M5 cap screws for the tightening.
Mil-spec 1913, yes the sizes match to the standard.
Anodising can be done,just need to find out the cost.
Not sure bout other bottle sizes,reckon all the carbon ones will be close to the same (mine 61.5mm dia)
Will post price,delivery time etc asap.