4-Pack Replacement Arrays for Ionic Detox Foot Spa Machines System, Ion Foot Bath Round Stainless Steel Coils

Hi, i want to order this but i just want to make sure that it's a (two pin plug) array? i know the picture show it, but just making sure. thanks

Where can i get a power cord?

Can you plug a 2 pin into a 4 pin machine?

This array can be use to hk-803b? i'm looking for hk-803b array.