Fixit, known for their gadget teardowns, has begun selling Transparent Rear Panels for your iPhone 4S. Why would you want to replace the glass-back of your iPhone and expose its innards for all to see, you ask? Well because you can! Installation is extremely easy, and all you need is a Pentalobe P2 screwdriver. Price? $29.99 a pop. If you’re interested in one of these mods, you will have to wait a bit as they’re currently sold out. The good news though is that iFixit is making more as fast as they can, and you can leave your email via the “Notify Me” button to get notification once it becomes available again. For iPhone 4 owners (GSM/AT&T), the rear panels have been out for a good 6 months now, and also go for $29.99. If a see through rear doesn’t quite turn you on, check out Material6′s fine wooden panel replacement. iFixit’s install video after the break.