I think he means the alignment of the tuner holes. Pretty normal unfortunately. Otherwise it looks like a great kit. It all looks normal, the humbucker should be fine.
You will find the pieces in that bag of parts will soon reveal their jobs. The springs are to hold the bridge in and are used as part of the tremolo. Just work through it one thing at a time and you will be fine.
I must ask - are you typing French into a translator or transcribing to English yourself? There are a couple of odd words used - but it still makes sense :)