yep hoop, its ET45, and it might be a 6.5J, as mine looked the same on my ronal multispokes
tbh I would put a
lower profile tyre on, like 195/45/16 or 195/40/16 if you really wanna drop the car
ET45 means you would need like 7mm spacers to have same offset as ronals/other wheels
ibiza's came on
best bet for spacers is put the wheels on the car, decide how much more poke you want, then buy the appropriate spacers
as it is multispoke, you might need spigot rings for the centrebore (this is the centre hole of the wheel, measure that and write up the measurements) the
ibiza's run 57.1mm centrebore
if smaller than that (doubt it, but possible) you will have to get it milled out (will be pricey, so just sell up and get some other wheels) or if too big you will need "spigot ring" these sit in the wheel making the bigger size hole smaller