The FJ40 knob is available but is way too long for a 70 series.
Just get the correct 70 series iterations. They are still available new from Toyota.
The 70 series knob or the bolt itself (or both)? If it is all available then I will abort any attempt to duplicate and find another side project.
I didn't double check availability myself but people here was saying it is NLA (p/n: 56453-90K00) and not even Dave could get it.
56453-90K00 appears to be for Hiace spare mounting as well.