I isolated the noise to something inside the LR strut. Replacing a strut normally involves removing it from the car and disassembling the various components, (the shock absorber, coil spring, upper mounting hardware, insulators, etc.). Parts are usually replaced as needed. However, the struts in my car are OEM from 2000. Replacing a strut without replacing the 16 year old coil spring and rubber insulators just doesn't make sense. Monroe makes a complete assembly for this car which makes life much easier, and much cheaper. And a strut/shock absorber assembly is one of those items that is always replaced in pairs.