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W+ is an AC feed which is usually used to drive a tach. It's unnecessary in your vehicle. If you find you are getting radio noise, you can use it for a suppression capacitor, otherwise ignore it.
On your old alternator, there are three terminals. The two large ones are both B+, for some reason Mercedes used two cables for many years. The small tab is D+, which provides excitation current and operates the dash light. You have corresponding terminals on the new alternator.
What I would suggest is to run two new wires. The first would be a small wire for D+. This can be 14 or 16 gauge, as it won't carry much current. The B+ wire should be heavy...maybe 4 gauge would be appropriate, or you could probably get away with a pair of 10 gauge wires if you want to do like Mercedes. Where these will go is to the junction box on the right apron, near the battery. Once the new wires are in place, the old ones can be disconnected and taped off.
I'm not sure about that pulley. A larger pulley won't work well with your belt system, unless the alternator itself is a smaller diameter than stock. It will also derate the alternator, since it will turn more slowly, maybe that's what they meant by 90A.
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