I've searched around and have found only Omix and Dorman as making stock length shackles. I want to replace mine when I do swap in new leafs. Both have mixed reviews regarding quality. Are there any other one's available?

 

I used the stock ones from crown and they were a perfect match. Hope this helps.

 

The Crown ones may be fine.

I bought some Dorman shackles and returned them because the bushings weren't pressed in correctly and nuts felt like they were aluminum but a magnet stuck to them. I bough dealer shackles, nuts, and bolts instead.