mosoto might be right about the indent tab, I start noticing it a few minutes after my post... but the top one is a clip with a plastic catch, so I reckon once it's pried open from the bottom and tilted, with the same flat head i could press the catch clip at the top to release it...
Blitsc,, yes you can get them, mine is 2003 model so this is a painted plastic one, painted in aluminium/silver finish.
not sure about later model if that's yours, you might as well contact riverside infiniti to ask it... got mine off ebay, under riverside infiniti's store.
not sure old vs new model but if the new one is brushed aluminium, and your car is early model, it may not look the same with your door latch opener.
you may have to replace the whole grip and door latch/lock latch to make them look the same.