Anyone know if an XPR7550e complete housing (screen, keyboard, speaker, accessory connector, not just the case itself) would fit on the original XPR7550? Or are there hardware differences between the two models aside from being able to be programmed over the air? I need to replace the housing on my XPR7550 (legacy) and don't want to pay a whole bunch of money for it. There's a whole bunch of XPR7550e series housings available on eBay and they're relatively inexpensive. Thanks!