I bought the kit on that link and have it fitted. It all arrived fast, well packaged and I didn't have any issues with the seller. Everything was brand new and I'm pleased with it since its been fitted.
Are you basing your quote on previous experience?
No disrespect to you but it would be good to provide a better explanation than "they're cowboys and will rip you off" so that people like me understand why they shouldn't buy from them...