The Mk2 Mondeo (1997 - 2000 I think) is 4 x 108 pcd, so the wheels that you are looking at should fit mate.
Not sure what the offset differance (if any) is for the Mondeo compared to the Contour though.
I've got 8 x 19" ET42 OZ Superleggera's with 235/35/19 tyres fitted to my '97 ST24, rubs on big dips with 3 people in the back but once I've had the rear arch's rolled a bit more it wont rub anymore.
Hope this is of some help to you mate.
'97 ST24 Mondeo, Panther Black
19" OZ Superleggera's, lowered on Koni/Eibach's, a bit of bling & a Wizard of Nos nitrous kit
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