Well my tires are wearing badly on the inside tread....so I bought new tires and went to get it aligned....but they told my my lower ball joints and inner tie rods are shot...so....should I replace with OEM?....how hard of a fix job is the lower ball joints and tie rod ends for me to do? Anyone with CLK experience????

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1999 CLK 430
W208
113. Engine
105,000 Miles
Raptor 245/40/17