RS6 Alloys help !

[BeeKay]

sup guys just brought myself a a3 1.6 X reg everythings perfect on it just having a few problems with the wheels i got some 19" RS6 alloys with it (old ones) they have spacers with them as they dont fit directly but one of the spacers if messed up as the threading on it has gone , any ideas on what size spacer i would need etc as im completely lost dont wana buy the wrong one , any help would be appreciated !

thanks H