Hook: Wall Medium (Blue Square)The Art: Rakata Prime decoration fits into a blue medium square wall hook.
Hook: Wall Large (Purple Rectangle)The Art: Rakata Prime decoration fits into a large purple rectangle wall hook.
How to Get an Art: Rakata Prime Decoration
Cartel Market Decorations
The Art: Rakata Prime deco is part of the The Arneclin Masterpieces, a set of decorations that you can buy directly from the Cartel Market with Cartel Coins. All decorations from the cartel market, including the Art: Rakata Prime deco, can usually be found on the Galactic Trade Network (GTN) and bought from other players with credits.
If you're looking to get an Art: Rakata Prime, the easiest way to get it is to head to the Galactic Trade Network (GTN) in SWTOR and buy it with credits from another player. You can also buy the full The Arneclin Masterpieces from the cartel market or GTN, which includes this deco and a few others that match.