Here's a link to a black cab on ebay. Look specifically at the shift knob and the oil, tach, speedo gauges. Other pictures show steel inside door handle and more. I realize this violates the look of the era, but it definitely personalizes the car - and I would keep the originals anyway.
http://victory-motorcars.ebizautos.com/shared/viewer.aspx?iid=1150162&src=eBay