Here's a pic of the new one, they came with RB250/300 arms and had the ROUND arm board cut out, were glass black and had the switch where your is.
http://www.needledoctor.com/s.nl/it.A/id.2146/.f?sc=8&category=574
http://www.needledoctor.com/s.nl/it.A/id.2146/.f?sc=8&category=574