I have also listed this brake system for sale on facebook marketplace karting sites and ekn classifieds. The item "Praga / IPK / Formula K Shifter Kart Front Brake System Version STR-V1 2014-2017" is in sale since Saturday, December 21, 2019.
This item is in the category "eBay Motors\Parts & Accessories\Performance & Racing Parts\Kart Racing Parts\Shifter Kart". The seller is "racecb" and is located in Orlando, Florida. This item can be shipped worldwide.