anyone have experience with NGK spark plug wires for a 1991 560SEL? they look to be well made......

Are they copper core? if not go for the OE Beru wires!

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Just go with Beru or get the MB wires, which while a bit more expensive, will be of the proper length and have a nice sheath around all of the wires to keep them together. Generic wire sets (even OEM) tend to be of one length and can be messy underhood.

The best deal on factory wires is going to be through parts.com (get the part number first through the MB EPC).

Cheers,
Gerry

doesn't Bosch make spark plug wires for this car?

Bosch may be the manufacturer of the OE part available from MB. I have heard mediocre things about their wires recently though. Bosch also makes a "generic" set of wires that will easily fit the car, but where some of the wires are longer than the stock wires and don't have the outer "sheath" that the factory wires do, to contain/neaten the bundle.

If you decide to purchase aftermarket wires: I have heard only mediocre things about the Bosch wires' quality in recent years, but have heard great things about the Beru wires. I have no direct experience with this, as the two sets of wires I've purchased in the past few years have been the OE MB wires, which are an exact/direct fit.

Cheers,
Gerry