Just what kind of car are you needing them for? If you need them for a race car, just Google it, if they're for an on road or off road vehicle, ck with the manufacturer, but personally, I haven't seen anything lately for a race car, except the tie on kind, Snapper riding mowers use a 1pc rubber flex cover on their drive axles, I have used them before, then decided it wasn't worth the effort, neither the cover, nor the shock lasted long enough to worry about it! Bob!