His may of been asked before but I cannot find the answer I'm looking for:

As I've got oil everywhere in my engine bay and I'm in the process of pulling my gearbox out for a clutch change. Which head gasket do I need as I see on paddock spares there is different mm ones and notches, this may be obvious but is it a case of pull the old gasket out and just order like for like?

Many thanks in advance

count the number of holes on your gasket theres a tab on the head gasket poking out between 3rd and 4th injector area

Thank you for the response was very useful