I assume that your RS has a heated windscreen as the old alternator is a 70A one.
The two spade terminals on the alternator on the right are generally only used with 55A or lower alternators. The other connections are probably for different types of car with bolt-on terminals as standard.
The W output is a single-phase output normally used for things like Diesel revcounters.
The D+ output would be the blue wire for the battery light on the dash
The B+ output would be the big red wire from the battery/starter motor.
I would say you have a 55A alternator supplied, not a 70A one. Check the label on the side of the alternator to confirm.