VPI HW-19 Springs

Maybe someone can refresh me as to which springs went with the VPI HW-19 series, Mk1/3/3/4, I have a HW-19 that started out as a first generation HW-19 and updated over the years to Mk4. I have multiple sets of springs that are black, silver and gold. Some of the spring caps are stainless steel, others are black plastic and others are black plastic with three silver metal dots on top. If someone could narrow down the correct springs for the MkIII and MkIV I'd appreciate the help.