OZ Ultraleggera, other questions to Options

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I found some oz 18" ultraleggeras for a decent price and was wondering if they will fit. The guy says they will fit an audi a4 and a VW jetta. I looked the rims up on tire rack but the options for the celica are only the 17". Also I searched members rides and they seem to have 17' and below. Then I looked them up for the jetta on tire rack, and the wheel specifications are as followed....

Offset 35mm
Backspacing 5.87
Bolt Pattern 5-100

225/40-18

Also I was looking up all the mods to do for a celica and should I do the wheels first, gt4 hood and bumper conversion, or anyone else have any ideas. I dont think i will be doing any performance mods since it will be my daily driver.

Thanks.

Posting my first pics of my celica today!

[drumbum]

Also since you mentioned it would look goofy, I now have come to the conclusion that I will do suspension when i buy the wheels. I added suspension questions above so in the end it will look right. All help is appreciated.