Global west upper and lower control arms with a stock moog K-8036 ball joint. At some point, probably at the TUV, stuff got removed and put back without putting the retaining ring back on the dust boot. they did this with my rear brake caliper. Removed and put back on but not tight enough and it fell off and got destroyed. So my dust boots keep falling down because there is no retaining ring. A call to Moog shows that they don’t have any spare retaining rings and if you want a retaining ring, you have to purchase an entirely new K-8036 ball joint kit. This is a bummer because the ball joints themselves are in perfect condition, it is just that the dust boots keep falling off. So I have to purchase a new set. It seems wasteful.