IJ after much deliberation and researching in the direction you pointed me, I've come to the conclusion that I'm gonna not bother with the TTR/JZA70 factory spring and just jump straight to a set of coilover springs and a good quality sleeve kit on a set of new TEMS shocks. If I ever find a set of threaded lower mounts I may revisit the idea, but this setup I think will be ideal for me otherwise, just need to find a set of really good bump stops to ease my mind and I think I'll be set. Thanks for the insight.