No idea if these would work but if they did it would be a super cheap option for headers.

https://www.amazon.com/Toyota-Tundra-Stainless-Exhaust-Header/dp/B007C8ZO2C

 

They sound way too cheap for them to last longer than a year. I bought cheap stainless headers (which were more expensive than those) for my Contour and they were cack. Welds had cracked after about a year and they never fitted very well. I think you might find on the Tundra and Landcruiser that the engine bays are slightly wider between the shock towers, and the firewall might be different. The only way to know is to put them side by side with proper LS430 headers and measure them. A quick glance at them does look like they could fit though. They will bolt to the heads correctly however