305/50R20's should fit w/o a leveling kit.
305/55R20's should fit w/a leveling kit.
If you want a leveling kit, get PRG's set up.
Here's some websites to check how different rims and tires should fit.
www.bigcustomwheels.com/rt_specs
http://350zx.com/tire-wheel.html
www.miata.net/garage/tirecalc.html
John
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2004 Titan CC LE 4X4
OR/BT Package
Volant/Banks
Rancho 4" lift
Eagle Alloy 114's
Toyo M/Ts 35X12.5 20's
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