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I would say its 3/8' also. Go treat yourself as you will likely need the same size for plugs in the intake that won't be used.
I know your water temp sender will go in one of those holes.
You want big allen wrenches? Have a look at the one thats used on your adapters lugs should you have the Halibrand (read trigo) wheels.
I am assuming as you do have an ERA
Thats 12mm i think.
Tim
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