Have you driven the car to see the results yet? The reason Im asking is that the Nylon gear is dependent on the inner drive gear.
The Supra mechanical is pictured here
http://www.toyodiy.com/parts/p_U_1991_TOYOTA_SUPRA_MA70L-BJPVZA_3505.html
With an internal drive gear here
http://www.toyodiy.com/parts/p_U_1991_TOYOTA_SUPRA_MA70L-BJPVZA_3510.html
And the Aristo inner drive gear is here
http://www.toyodiy.com/parts/p_J_1995_TOYOTA_ARISTO_JZS147-BEPVZ_3510.html
They look like the same part number so it should work, the Supra 2J internal gear is the same also which is here.
http://www.toyodiy.com/parts/p_U_1995_TOYOTA_SUPRA_JZA80L-AJPVZA_3510.html
The Supra mechanical is pictured here
http://www.toyodiy.com/parts/p_U_1991_TOYOTA_SUPRA_MA70L-BJPVZA_3505.html
With an internal drive gear here
http://www.toyodiy.com/parts/p_U_1991_TOYOTA_SUPRA_MA70L-BJPVZA_3510.html
And the Aristo inner drive gear is here
http://www.toyodiy.com/parts/p_J_1995_TOYOTA_ARISTO_JZS147-BEPVZ_3510.html
They look like the same part number so it should work, the Supra 2J internal gear is the same also which is here.
http://www.toyodiy.com/parts/p_U_1995_TOYOTA_SUPRA_JZA80L-AJPVZA_3510.html