P11A Petrol Tank Badges

Hi All,

I have a P11A (124392) that came with what I guess is an Indian petrol tank, the badges were glued on. I have new badges and some blind threaded inserts to braze in/on, but am struggling to locate the badges properly with the bulges on the sides of the tank.

Can anyone tell me the measurements of the front badge screw holes please, if I can find this out I will be fine.

I'm thinking that screw hole to bottom edge of the tank, and the front edge of the tunnel would be best.... or have you a better idea? 

Thanks

Peter