That era Hiluxes comes with either front-drum, single or twin piston front calipers. Twin pots are interchangeable with Hilux/4runner four pots. As far as I know only RN41 came with twin pots but be aware that not all of RN41 have twin pots. Single piston MIGHT be interchangeable also with Hilux/4runner four pot caliper. I dont know do you have any local engineering in these hiluxes.