Piston Needle Small end Bearing Fits Husqvarna 181 181XP 281 281XP 288 288XP 298 385 385XP 390 390XP 394 394XP 395 395XP XP 2100 2100XP 2101 2101XP  TS510 TS760 K950 Chainsaws First class quality non oem part to replace OEM# 503 25 61 01