I went about the DD installation by using existing bezels and splicing two halves together.
My frame holds the bezel in place along with the two original screws. The frame goes in last and is screwed into steel plates mounted above the frame.
I have made two versions of the DD install, one with the buttons in the armrest which keeps the modified ashtray, lighter and the passenger seat belt light as they were and a one-piece bezel with the buttons in it. The passenger seat belt light and lighter are relocated to the gear shift module, this is my favoured design and the one I shall use when finally painted.
Details are in the following link. CLICK