Which kilgore typodont? help please

[hydhaval]

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hi, i am looking to purchase kilgore typodont 200 series, i found it on google but they are giving me 4 options, i m not sure which one i should choose......
1) 28teeth set soft gingiva
2) 28 teeth set hard gingiva
3)32 teeth set soft gingiva
4)32 teeth set hard gingiva

Which one is perfect for practicing bench exam for UCSF, UCLA and San Antanio college..........please help me........