The information I researched last year showed that Foose was running 18x9 in the front.
Likewise, another member mentioned 18x9 for the front wheel in the following thread Foose Pantera Link
He also mentioned that his buddy worked at Foose Design that gave him the information in the thread.
I hope this helps. I will dig up the information and price on the offset tool later this evening. I recall it was rather pricey.