LED replacement bulbs, Optocouplers, Fiber Optic Components

 Buy Lite-On LTST-C171KRKT in Reel. Red 2 x 1.25 x 0.8 mm 130° Water Clear 54 mcd 2 V Surface Mount LED.

https://www.futureelectronics.com/p/semiconductors--optoelectronics--leds/ltst-c171krkt-lite-on-9582735