Thanks for asking, fren..
im in kl/setiawangsa/ampang/pandan area
i dont provide installation - u can do it at any accesories shop, will cost u range from RM30- 40
Differences 7 wire can have the heater function
available few sets, means got few colours
and yes, u may use the original housing (cover) but u have to transfer all the devices inside to our existing one (but no MMC lah :D )