So far from responses and my digging - Axxis metalmasters do not make a pad for the W210, the EBC's have had a mixed reception on this Benz model and forum, Mintex - not that good. So it's looking like I'll have to go with the Porterfield's, any other experiences with the Porterfield R-S4 before I order them.
Tolahouse 97 E420
Azure Blue - Xenon Headlights
Pioneer HU/EQ/CD, PPI AMPS, MB Quartz Speakers
Brabus 19inch Monoblock5 2pc/245/275Yokohama AVS Sports
H&R Springs/Bilstein Shoxs
"Sound, Power & The Ride"