Those cheap ($20 per set) Energy Suspension links have polyurethane bushings and come in black like the originals, if you don't like those beautiful (NOT!) aftermarket red bushings. The metal parts even look CAD plated, but may be yellow zinc plated.
In case you don't want to read the entire thread, the right Energy Suspension link kit part number for my 230SL was Energy Suspension 9.8165G. The G is for black bushings.
Tom Kizer