Fiber adapters SC, ST, LC and FC for DTX-xFM2 fiber modules

The following photos should help you identify which adapter you have. Confusion is often most seen with the NFA-LC as the receptacle is round yet the LC has a square case.
If you need just one adapter, the part number is appended with SINGLE, so NFA-LC would become NFA-LC-SINGLE. 

LC Fiber Adapter


LC Adapter with Square Peg
  "Square peg in a round role"



ST Fiber Adapter


FC Fiber Adapter


SC Fiber Adapter