The following is a list of current Roland pads/triggers that are compatible with the TD-07KV:
KDA-22
KD-200
KD-140
KD-120
KD-10
KD-9
KD-7
KT-10
KT-9
PDA-120L
PDA-100L
PD-128-BC
PD-125-BK
PD-108-BC
PD-128-BC
PDX-100
PDX-12
PDX-8
PDX-6
PD-8
VH-11
VH-10
CY-16R-T
CY-15R
CY-14C-T
CY-14C
CY-13R
CY-12C
CY-8
CY-5
BT-1
RT-30K
RT-30HR
RT-30H
For a full list which includes discontinued pads, see the Pad Type List on page 20 in the TD-07 manual.