Brew unit - mouting pieces

I've just cleaned my Nespresso but during drying process, two pieces has been removed from brew unit. I'm sure that the little plastic pipe is from the brew unit but have a doubt about the little black plastic piece with the copper spring.

Does anyone knows how to mount these pieces into the brew unit please ?

As you can see here, the brew unit piece (I've unmounted all the parts after the pieces came out of here) and the two little pieces

And here is the hole where the one or two pieces came from