Can anyone help me as to where i can source a gear kit for my 6spd 3SGE? TRD has a listing for one, but it is discontinued.

i have a brand new trd gear kit put into a 6 speed gear box that i cant use ,comes complete with the std imput and motion shaft etc but what it has cost me is what i wont for it as im still loosing money on this .complete $5500 auusie if it goes for this it sells if not it doesnt worry me the trd gear kit cost me 3500 plus freight and goverment charges of $750 $ 600 to put it into the gear box , brand new gear box to begin with was $ 2800 ,so all up it was 7650 so im happy with 5500 plus freight