Alloy wheel fitting + Bore size+ lowering spring

I'm trying to replace my skinny k11 13" tyres with a set of used 15" Fox 6 evo alloys with 195/45/15 tyres, and I hope this would make the car more stable and nicer. Link below
http://www.halfords.com/webapp/wcs/...0551_crumb_33967-55061_parentcategoryrn_70551
I'm also fitting 35 mm lowering springs ( I hope the shocks will be alright..). Bit worried that the wheels wouldnt fit and something would go wrong with the springs. On the link it says 4X100/4X108 dual fit, but I do not know whether they would fit my wheel hub perfectly and not vibrate? Will the wheels rub the arches? Is it safe to have springs and what can go wrong?
paranoid earthling...:sick:
 
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