Dont quote me 100% on this but i belive that SS basically stole tials wastegate design in every way, and that those will work in it. Just be VERY careful when putting the wastegate head back on... it those bolt holes strip out VERY easy!! i did it once.
www.hrprowelding.com
35/38mm springs are both interchangable, so either one.
Blew it up, build numbers coming soon