Confirmation on bolts for spare wheel carrier

[Snoopy23]

Sorry but gone through numerous posts about bolts for spare wheel carrier,
have purchased second hand vw alloy with 235/55/17 tyre and a secondhand carrier which came with aprox 2 55mm length bolts and a security bolt with key.
being a 235 tyre will i need the longer bolts? and do i need what looks like plastic spacers (see Photo) i presume these are just to stop overtigtening bolts? are these indeed necessary!
Lastly the bolt with the bit of metal on the end is not complete any one have the part no? presume i need the long one?

 

[dspuk]

I believe the spacers are so the unit hangs at the right heigh and hold the carrier & wheel without bouncing. The end “bolt” is a hinge pin. The genuine full sets inc bolts, spacers and pins are easy enough to pick up online from recollection.