Bought mine from there and my PS2 rides and handles wayyy better than before. You may also want to consider Cobra suspension. It's cheaper and I guess the quality is almost the same as the genuine lowering springs.
I bought it here...
https://www.vivaperformance.com/genuine-polestar-lowering-spring-kit-polestar-2-performance-pack/ – Bought it here. I've been using these genuine lowering springs for 2 months already. The ride has been good and feels more stable compared to the factory ones.