I do not have the part number to hand, all I do know is that if you go into your local Benz dealership and ask for an OVP relay for your model, they will automatically give you the updated version.

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Current Mercs
R129 1994 300-24SL
W124 320E Turbo Technics Twin Turbo 350bhp

Previous Mercs
W124 1986 Quad Cam AMG Hammer, 45,000 miles
W124 300E Turbo Technics Twin Turbo 320bhp
W124 E500