The sexiest, curviest radiator I know of is for a ZXR400. Fuggin huge thing it is so it may not fit, but since there are loads of ZXR400's on the planet you should find one cheaply enough to try.
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball