I know they had 4slot bds, if not mistakeing option bds sometimes had more slots depending on versions. I've always been told that newer versions, the ones with more slots, can replace older ones directly but not the other way around. You should be ok. I want to make you aware that the 5.06vdc should be between 4.8 & 5.0. Don't think +.06 volts would matter but you never know.