Nah they dont need to be high temp regular is fine, I'v got loads of spare nuts and bolts for the f4r shame your not closer
If you disconnect the top part of the manifold you may be able to get grips on the one that has snapped off. Same happened with mine and managed to get it out and replaced easily.
m6x1.0 thread and about 200mm long from memory?
any old bolt will do
200mm long? Are you sure??
yeah,, i slipped on the 0 button lollol i figured its a typo and he meant 20mm long.
Buy some from Renault, there only a quid each