I think those are the Toyota FJ steel rims, not an aftermarket solution.
If you haven't done a disc upgrade yet, I would seriously consider doing so and switching to 5 lug at the same time. This opens up an infinite number of wheel options then. I did ECE conversion on my front with a '72 5 lug leaf rear. On your 70, drums and axles will get you 5 lug in the rear. I think the ECE way is to go on the front and keep drum size ball joints and tie rod ends.
Welcome to the board.
