Hello, just bought a Signum 2.2 direct and need your advice!

On checking the engine, I have found some pins poking out of the inlet manifold under each inlet into the block, they seem to be rattling about. I think a plastic bar goes along under the inlet manifold and they just poke though holes into it.

I seem to have no purpose fir these, as far as I can see unless something is missing from my engine!