Mud flaps

Can anyone tell me the gap between the fuel tank and inner rear guard on a MK1?
I need to drill and rivet the brackets for mudflaps on my mk1, (doing a proper forest rally this year) as I dont wan t to drill into the tank?
Cheers
Shaun B
I need to drill and rivet the brackets for mudflaps on my mk1, (doing a proper forest rally this year) as I dont wan t to drill into the tank?
Cheers
Shaun B