Super Bright Yellow Light Led Replacement Bulb Single Mode P60 LED Drop-in Module Design for Surefire Hugsby C2 G2 Z2 6P 9P G3 S3 D2 Ultrafire 501B 502B and Other Hunting Flashlights :
26.5mm 6500K 3000K Yellow light Warm white P60 Drop-in Module Flashlight 501B 502B LED Bulb for SureFire G2 6P 9P L2 - AliExpress
2 Pack 10W 6500K LED Bulb 2.4A Single Mode 1200Lumens Drop-in P60 501B 502B | eBay