Well, they all look pretty similar. There are 2 types basically, one for field controlled alternators and one for permanent magnet alternators. You need a 3 phase field controlled type. This type will have 3 alternator output wires (Honda uses yellow but 3 the same color will be them), a battery wire (generally red and probably the heaviest gauge wire with maybe even an extra protective sleeve), a ground wire probably green (or not, it might ground through the case mounting bolts), a control (ignition "on" power) wire - on Honda ones this will be black, and finally a field wire or two. Honda reg/rect units usually have 2 wires directly to the field coil, some others have one wire and ground the other field coil wire elsewhere. You can use this type if you ground your other alternator field coil wire.
An alternative is discussed at length in other threads where you separate the 2 functions. You need to make a rectifier using 2 simple single phase bridge rectifiers (one and a half really but you need 2 units) or one 3-phase bridge rectifier (harder to find) and get an automotive regulator module. If you are handy with electrical stuff this way is usually cheapest should you need to get a new reg/rect unit.
Looking at your picture I think that is the correct type. You just have to figure out which wires do what. You can test the rectifier section with a multimeter but the regulator part has to be tested in operation unless you have a variable DC power supply with about 0-15V available.
