I own a 2004 RG370DX and I've replaced the pickups on my guitar with Seymour Duncans. I can tell you that the pickup cavity is quite cramped; it may be a tight squeeze to fit the EMG in. You will have to get it modified. Furthermore, you cannot access the battery cavity from the back so once your battery dies, you'll have to remove the pickup and replace the battery. The EMG battery is supposed to be good for 3000 hours though which should be approximately equal to 6-8 months if you play every day.
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