The Ford Capri Laser Page

Does anyone know the bolt size for the 4 holes in the clutch bellhousing where the dirt shield attaches please?

I have the 3 litre Essex V6 mated to a Type 5 4-speed gearbox. And I intend to plug the gaping hole with this:

https://www.capriclub.co.uk/Essex_Gearb ... --739.html

I don't have a selection of bolts to try!