Use the link below to help calulate the size. The rim most likely will fit, but you gotta know what size tire goes with the rim. Find out from the seller, what size tire is included or what sizes can be put on the rim. For your convienence I guessed on a couple sizes and they would fit:
P245 35 R20 (speedo would be 2.302% too slow)
P255 30 R20 (speedo would be 0.5% too fast)
Tire Size Calculator - tire & wheel plus sizing
Stock Specs (16" Alloys)
16 Inch Rim and P215 60 R16
Stock Specs (15" steel)
P205-70 R15
P215-70 R15
EDIT: Just remember Tires to fit 20" rims are going to run $170+ per tire and you'll only get "Ultra-High performance" tires. Just think about that cost in the future.
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1998 Ford Windstar GL 3.8L 253,100 miles
2005 Toyota Prius Package 6 1.5L 135,000 miles
2006 Toyota Sienna LE 3.3L 36,000 miles
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