There are no aftermarket keycap set that will iOne backlight keyboard compatible 100% due to the different size key on the bottom row. Best bet would be to contact the iOne sub brands (Qpad, Xarmor, Max, Tessoro, Razer, etc.) and plead support/sales to sell you a keycap replacement set if it must be backlight compatible. If you don't mind regular keycap your options become a little more.