I doubt this is much help but the Doral manual shows the part (the entire lamp) as " 425-00-1602 Pedestal decorative lamp" supplier "GAN100"
These codes are part of the manufactures name- ex BOM is BOMAR but I don't know what the GAN stands for.
I suspect it will be easer to relocate your aft cabin light forward and buy new style replacement for it or change all.