If Summit indeed sold you a kit entirely from "The Right Stuff", that companies' kits have worked well for many members on this forum.
Either the wrong kit was sent, or maybe it got packaged wrong. Either way, both companies are solid and work to make us DIY'ers satisfied.
I've previously installed a CPP rear disk kit. Initially it did not fit and there were some issues that CPP worked to resolve fairly quickly. I got everything installed and working but it was marginally satisfying.
The KORE3 kits kits are a giant step up in quality and function.