I think I PM's this info to someone, but I forget whom, so here it is again.
In response to questions about differences in springs between different years of cruisers, Bear80 did a ton of research and comparison (paint codes are referenced

) and it appears there are differences in the springs. I don't know what year FJ80 you have, but check out this thread for more details than I need to know.
There may be more details in other threads, but I found this after a quick search, so I stopped looking.
Hope this helps.
http://forum.ih8mud.com/80-series-tech/48250-stock-springs.html