You can buy brand new r154 in new zealand for around £900ish. Its the later box aswell so abit better. The price can double by the time you get it home just depends if you can dodge customs. Best option in my opinion, atleast you know what your getting vs second hand.
I also used a mk3 auto supra front shaft, splines and all are the same. 23 i think. You can get them for nothing practically.
I also used a mk3 auto supra front shaft, splines and all are the same. 23 i think. You can get them for nothing practically.