Stock friction shocks are junks! Yeah Racing shock-gear kit completely eliminated the second rebound, high quality and beautiful. Follow the instruction carefully and no leaking at all.
One advise, for my WR02 none of the supplied springs are strong enough to support up the car. Even with supplied hardest springs, your car will sit low and sag down. I ended up using the stock springs to go with Yeah Racing dampers.
They come with all the parts to mount and set them up. different spring, discs with 1 up to 4 holes, V shaped holes etc.
Assembling them is difficult as they are not well finished and e-clips don't fit, I broke a lot of them and in the end I stucked them to the shaft without properly snap them in. Anyway you have spares in the kit. Once mounted they leak, no matter all the O rings they have, they loose oil even if I don't use the car loosing efficiency. I have a full set of springs an mounting parts, but I will use them on better shocks.