Guys with 18's: what offset?

[NKau]

I'm looking at some Roush wheels with 30mm offset up front and 20mm out back. Will this work? Thanks.

 

[NKau]

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[GT Trooper]

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I also have the 18 inch argents that I'm hoping to put on my 87 vert this fall. If or when you find something out please let me know.