GP Horncast Question

Hi All,
I'm trying to repair a GP horncast and i need to know the correct size of ''taps'' required and the correct size of holes to drill for the ''taps''
Its 1 of the 4 main screws that connects the horncast to the leg shields and the 2 small ones that connect the front mudguard to the horncast.
Thank you for your help
I'm trying to repair a GP horncast and i need to know the correct size of ''taps'' required and the correct size of holes to drill for the ''taps''
Its 1 of the 4 main screws that connects the horncast to the leg shields and the 2 small ones that connect the front mudguard to the horncast.
Thank you for your help