2 brief questions

[SeanR8Davis]

Could someone please tell me the bore size and approx length of the vacuum
Pipe that runs from near/ beneath the valley ( inlet manifold) to I think, if my memory is correct to the throttle body?
Might be wrong re the throttle body but definitely from the valley
I may have a vac leak??

Secondly, does anyone know if the part number for the small plastic retaining studs/ fasteners that secure the inner wheel arch tubs? Once removed they never fit right again

Thanks in advance