Well I'll disagree with Dennis for once.

I used PBR Metalmaster pads, which are a bit more costly, but emit little to no dust, and no squeaking on mine.
If you don't mind ugly brake dust go with stock -- if you prefer to clean your rims only once every couple of weeks then go with the Metalmaster's or "green stuff" pads.
My 2c
~Paul
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'91 300E, 208k miles