hi all I have a white iPhone 4s and wanted to change the back and front to black. I just wanted to know where I can get the oem parts to make the switch myself. it's a iPhone 4s 16gb on sprint. I am looking for oem parts since I read those might be best quality since I am looking for one that includes the LCD as well. and do the kits that include the LCD use oem retina or a cheap one?