TM Glock 18C OEM parts where to buy??

[waltherglocksmith]

I am looking for the TM Glock 18C OEM PLASTIC rear sight, no metal (already have metal one and too heavy with the pgc metal slide combination, the slide don't lock back, with the plastic one, no problem. the rear one is broken).
if someone know where to buy that it would be appreciate,

I was looking at ehobbyasia and redwolf airsoft and some other, but no success. cannot find them.

thanks

[Invasian]

PMd