This gear set is designed for use with the PL-L1000A and PL-L1000 models of record players. 
It was designed to replace and match the original Pioneer parts that are not sold anymore so it is a non OEM replacement .

The set includes the plastic parts #2 and #3 that are part of the arm lft assembly to lift and lower the tonearm:

PNM-394 Main gear
PNX-272 Cam