Hi, It gets confusing as you know what sometimes but Intel usually has multiple form factors of each of their wireless cards they put out.  (it's really a change on the chips that change).  It confuses me all the time. I can tell you that looking at the internal product overview data for the Insp 5558 that the Intel AC7265 is one of the cards that is listed as an available option at point of sale, so you shouldn't have any problems. I hope this helps. Todd
I have the Dell Inspiron 15 500 I5558. I bought it in August this year. Since day 1 I've had problems with the wireless adapter. I've updated drivers, I've done troubleshooting with Dell, etc. The card that came with laptop is Intel AC 3160 and if you just Google Intel AC 3160, you will get several hits of users having trouble with it. My tech support was unpleasant and very long. I knew a lot more than the tech did. He finally decided the card was bad. I said please don't send me another 3160 - there is a problem with that card. He agreed and he said he checked and the AC 7265 would be compatible with my laptop. I've seen pictures of my adapter and pictures of the AC 7265. They are both PCIe cards, but the AC 3160 has just one antenna and is half-height. The 7265 has 2 antennas and is NOT half-height. I've seen on the Dell website the NEW Dell 15 5000 comes with either the AC 3165 (I think) or the AC7265. I know it will need to have an antenna added if they use the 7265, but will it work? Will it fit? I realize the 3160 is half height, but that doesn't mean that there isn't space for a taller card.[IMAGE]
Compatibility of warranty replacement wireless adapter