the wheels will fit presuming the centre bore is big enough,165 tyres sound a bit too narrow though,i run 205s on a 6.5" wide rim
in therory the size should be the same, 195= the width of the tread in mm, 50 profile is the percentage of the width ie 50% of195= 97.5mmcool, ill check the bore on them.....i know 195/50 r888 tyres are pretty big - bigger than a proxy 195/50, so should stretch similar to a normal 195/50.
in therory the size should be the same, 195= the width of the tread in mm, 50 profile is the percentage of the width ie 50% of195= 97.5mm