Found this in the cupboard the other day, it had been in the glovebox of my old 280SE... pretty sure it's OEM, though it has no part number, just date/build stamp from 1979. It may fit other models too. There's not many 116s left in the UK so thought I'd offer it here. $30 plus shipping.

Mercedes W116 Radio Zebrano Blanking Plate | eBay

__________________
1993 320TE M104
---------------------------------------------------
past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
----------------------------------------------
"music and women I cannot but give way to, whatever my business" -Pepys