Inlet manifold/throttle body gasket

Hi, Hope this thread is in the right area as i have not posted on the forums before.

I am pretty sure I have a vacuum leak so i am going to change all the gaskets on the inlet manifold. i have sourced the 4 matching ones for one side of the manifold but cannot find a replacement for the egg shaped one on the other side :/. Are these supposed to be replaced or just repaired? dont want to take the manifold off to then find it knackered and then be carless until i can find one. thanks in advance