The accessories that do not fall into the main categories, largely Redarc branded: 24V to 12V charge equalisers, stainless steel tank level sensors, cable kits for those sensors, fuse kits with holders, relay kits, vehicle-specific mounting brackets and MC4 solar connectors.
These are the parts that decide whether an installation takes one day or three: the right cable kit saves crimping twelve terminals by hand, the dedicated bracket saves drilling a crossmember, an inspectable fuse holder saves stripping half a dashboard to find out why it is not charging.
If you are after an accessory for a specific model, the code of the main product is the quickest reference.