Model Variants (Including Prototypes)
F.K.58 (Prototype) - Prototype model; fitted with Hispano-Suiza 14AA radial engine of 1,080 horsepower; 2 examples produced.
FK-58 (Bristol Taurus) - Proposed Dutch production version; to be Fitted with Bristol Taurus engine; never produced.
F.K.58 - Initial Production Model; fitted with Hispano-Suiza 14AA radial engine; 7 examples produced.
F.K.58A - Second Batch Production; fitted with Gnome-Rhone 14N-16 series radial engine of 1,030 horsepower; 11 examples produced.