This is an iPhone 4/4S dock for a 99 Toyota Tacoma. It mounts in place of the passenger airbag switch and uses the Apple 30pin to USB cable.This is designed to fit an iPhone 4 or 4s with a case.The iPhone 5 version is here: http://www.thingiverse.com/thing:40254Once printed, feed the usb end of the the cable through the top of the pocket and pull/push the 30pin connector into the hole. This make take some force (try not to break the plastic.) It is a very snug fit and the connector will not come out unless pushed from the bottom. Route the cable in the channel at the back of the dock.Remove your radio bezel and then remove the airbag switch. You can push the airbag switch into the dash and leave the wiring connected. Use two short (.5") screws to mount the dock in place of the switch. I suggest pre drilling these holes so the plastic does not split.Once in place, route the usb cable to the back of your in dash stereo and reassemble.