There is a guy in the USA who has heaps of old AMG parts - everything you can think of; go to EBAY; Note he advises as follows:

"We do have a policy that buyers purchase our AMG catalog from ebay before we give any price quotes. If you purchase parts from us, you get your money for the catalog refunded. It is on ebay and is Item number: 8062164012 "

I have it on good authority he is genuine; I have ordered some parts and will post back here; ALSO if you want an AMG front spoiler for W116 chassis go to:

http://forum.w116.org/index.php/topic,160.0.html