Finnish Navy Hamina-class fast attack craft
Armed with a 57mm gun, 8 Umkhonto SAMs and provision for 4 RBS-15 Mk.3 in place of the RHIBs at the back.
However recently the US is offering to replace the RBS-15s with Harpoon Block II+(ER). I am a little surprised, the 2 missiles seem to be more or less similar in (published) capability.
They are also building 4 corvettes to replace older ships. Possibly also armed with a 57mm (or 76mm) gun, the US has offered to equip the ships with 16 ESSM in Mk.41 VLS and Harpoon missiles.