It is absolutely a 500E-specific part (and here in the U.S. I believe there was only 1 part number for the entire production run).

I can't put my hands on the P/N readily-perhaps someone else can help

__________________
"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo