FRPP B springs would be my recommendation if you're using a giant wheel like that and you have ride quality concerns. Honestly a 20 is plum silly... 19's at most and 18's look best to me.
Remember.... the bigger the wheel the slower the car and the more you'll want to upgrade the brakes. Big wheels carry bigger centrifugal forces and take more braking power to stop, so if you're going that big... at least a 13" front and rear kit would be appropriate.
Enjoy.
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