et45

Just wanted to know if i can get 17" 5x112 ET42 to fit my ibiza??? Done a search, but can see as any1 has! :(

If the standard wheels on a LCR are 18x7.5 ET35 5x100 PCD Will the same size but ET45 fit with 10mm spacers all round, as this will put the wheels in the same alignment. Also if the spokes of the new wheels foul the calipers is it safe to go to 15-20mm spacers as this would put it to +5-10mm...

I've fallen in love with a set of Team Dynamics ProRace 1 in white. The site I found them on only selling them with ET45, they also say that this will fit my car. 1999 Seat Ibiza Cupra GTi. What will I need to make these fit?? Spacers?? I'm crap with wheels. Hope you can help...