Don't know if Orange45 runs Cruiser Brothers or not but Cruiser Brothers seems to be entertaining the idea of stocking these. If people signed up, I bet it could be a reality. Also, the 40 Channel came out with this review. Not exactly how a 40 will ride but very nice.
These guys are the US based distributor for Terrain Tamer:
https://cruiserbrothers.com/product-category/components/
Who knows, maybe with enough buyers they could end up stocking these springs.
I read your article and I'm excited for your follow up. Did you have the medium load ome springs? Also, how did they handle washboard roads? I think that is where the parabolics will really shine since they are lighter weight. Unless the dampers fade over the washboards.
I'm also thinking of...
We need to find someone with old ome springs that can swap and make the comparison. I have heard that parabolics ride pretty much the same on road.
How are your omes over potholes, speedbumps and curbs?
The next thing to see is how they compare to a set of Old Man Emu springs with the shims and anti-friction pads since both setups mitigate interleaf friction.
Let me know what they quote you on shipping. I don't believe their shipping calculator from Austrailia to the US. Their stateside vendor quoted $1000 for shipping.
They are out! Seach for Fj40 under Toyota on this page: Parabolic Leaf Springs 4x4 | Rated #1 [2023] - Terrain Tamer - https://www.terraintamer.com/4wd-products/suspension/leaf-springs/parabolic-springs