HP J4858C ProCurve Gigabit-SX-LC Mini-GBIC X121 1G SFP LC SX Transceiver-Dell Parts - HONGKONG FKA ELECTRONIC LIMITED
StarTech Gigabit Fiber SFP Transceiver Module - HP J4858CST B&H
Amazon.com: HP J4858C X121 1Gb SFP SX Transceiver - Small Form-factor Pluggable (SFP) Gigabit SX transceiver that provides a full-duplex Gigabit solution up to 550m (1804ft) on multimode fiber - Has one
HP J4858C Compatible 1000Base-SX SFP LC for Procurve