they are all the same arms (all eg/ek/dc)
you can just swap the hubs over but you need a special driver to insert onto the back of the hub and an impact to remove it.
Physically, and in terms of finding the parts it is a whole lot easier to just buy the arms that already have rear disc (either off a sedan ex, si, or 94+ integra) and swap them on.
There's also a how-to thread in the DIY area of hst that has this info and how to actually do it.
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