Since the hi-hat control pedal and kick pedal included with the TD-02K and TD-02KV are only available as a set, they cannot be purchased separately.
If these pedals are malfunctioning, either have them repaired or use a kick pad (KD series) or kick trigger pedal (KT series) that is compatible with the TD-02.
* The stand pipes may be in the way, depending on the kick pad size.