I have just removed my inlet manifold so i can replace it with a nice chrome edition, but i struggled getting the large (13mm) bolt out of the centre top (by the fuel pipes). I have proper rounded the thing off!!

Once i finally got it out, it seems its not a standard bolt but one that slots over another bolt inside the intermediate (fuel rail).

Does anyone have a part number, or know what this special bolt is called as I obviously need to replace it asap

Cheers