Advanced shackle for leaf springs

[wermbang]

Anyone every heard of these? found an ad browsing Truckin magazine
https://www.sulastic.com/default.aspx

 

[Trupiano]

I remember faintly seeing that awhile back. Although I wasn't sure what it did.

 

[Hotroder383]

I'm not sure about this, it allows the leaf spring mount to move and the spring was never made to be able to do that. I'd be damn careful about using these...

 

[rambob]

not the same designer, but I have seen them before.
velvet ride