17 or 18 inch rims Follow-up work on fenders and bumpers

Hello together I’m new here in the forum wanted to introduce myself. I’m from Freiburg and I was infected two years ago with the Chrysler virus. The last two years I’ve always borrowed a Grand Voyager for the holiday because I met someone here in Freiburg who rented the things I was enthusiastic about the car from the beginning because of the giant place offer and that you can save in most cases the racing to car rental or trailer rental Now after 14 years I exchanged my old Audi for a very well-preserved Grand Voyager 3.3L year of construction 2000( Luckily with LPG/Gas ) Now I wanted to ask if one of you already has 17 or 18 inch rims on a Grand Voyager and which rework could have been done for example on fender sidewall or bumper. I want to rearrange the family carriage externally and put a few beautiful 17 or 18 inch rims on it. h the right rims have already been found… Barracuda rims 8×18 and 9×18 I want to make myself smart at the rims dealer The selection of rims for this car at the dealers is extremely limited most of them have no report or approval or how to call it and he meant then you don’t get that at the TÜV has confused with it someone experience? and he tells me that I couldn’t even put 17 inch rims on the car without pulling the fenders + side walls. the 18 inch one would even have to widen the shock bars (however that should go ) Do I necessarily need the rim inspection where my vehicle is in it or is it not possible to get the registered by individual acceptance ? And then sometimes so general …. The hole circle of the Grand Voyager Is 5 × 11 4.3 that I have already got out now not (theoretical) all the rims that have this hole circle also fit on the car ? and the distance from tires to fenders changes j a not there yes the bigger the rim desdo cleiiner will become nevertheless the tires Or is that wrong ?? I am grateful for every tip Would I be happy if you write once what experiences you have made. Maybe a few pictures ?! Thank you already in advance