Ah yes I see now that they look different, sorry. I know a few people who have ordered stuff from EA so as far as completing orders and customer satisfaction Eternal Armory is a very reputable source. Though it definitely appears that is the wrong set you are looking for.
You could try talking to Fett_seven. He makes stubby packs (and paints them too for an added cost). He could probably help you out with just the accessories. Other vendors that make arena packs are MOW (Man of War studios) and NME props. Though I don't know if they offer just the accessories.
Sorry for the wrong advice.