Im going to talk about the dash first before I go into a remote mount.
Converting a dash mount requires the following. A o5 head, headbridge (plastic spacer from body to head), new flex cable.
With regard to a remote mount, you have additional pieces. the TIB (radio body piece), CHIB (control head back) and different remote cable going from a W series to an O series.
Most of my dept radios are O series with the exception of two older ambulances as they have the w series remote in them with dual head and probably would be cost prohibited to change out at this time. When the radio get pulled to go to a new unit will be when I make the switch over.
Frank