New MaximalPower Replacement 2-Pin Earpiece (with screw):

HYTERA Clear Coil Earbud Headset
Headset features:

New MaximalPower brand
USA based brand includes a full warranty and customer service.
Heatset is 100% compatible with original manufacturer equipment.
Headset Type: Clear Coil Tube Earbud (PTT)
Connector Type: H1 (with screw)
Heavy Duty with KEVLAR Enforcement
Push-To-Talk (PTT) mic with single clear coil listening tube
Heavy duty, rugged polycarbonate housed PTT mic.
Metal clip secures the PTT Mic to the user's lapel, collar, or sleeve, conveniently locating it for easy use.
Color: Black/Clear
SKU#1704

Works with:

Hytera (HYT):
TC-500, TC-508, TC-518, TC-580
TC-600, TC-610, TC-620
TC-700, TC-700EX, TC-700ExPLUS
TC-900
TC-850
TC-1600
TC2100
TC-3000
TC-3600
PD-502, PD-562

Replaces OEM parts:
H1 (Hytera 2-Pin w/Screw)