Ok well if you get your calculator out and crunch some rolling radius numbers, you will see that 235/35 tyres have @5mm taller radius than the stock 225/40*18. My car was occasionally rubbing the arch on that stock size / ET51 Monzas using VWR suspension with a 20mm drop. Moving to 235/40*19 would be a further 12mm taller sidewall, hence @17mm more than the 18" stock and would likely be ok without the arch liner screw mod. Suspect you would start running into trouble with 45 profile, especially if you have a low ET / offset pushing the wheel further out in the arch.