The rear links are the same. There is a different torque/thrust link you can get that is aluminum instead of stamped steel (used on the W210 station wagons). But there are no different links for the Sportline package. The price sounds suspiciously low - like that's for one side only (4 links instead of 8) or something. I'd expect all 8 to be $300+? I haven't checked prices closely with aftermarket vendors though. Don't forget the fifth link (lower control arm, also called the 'spring link' because the coil spring sits inside). That has a bushing on the inner pivot. And it connects to a bushing on the outer edge that's pressed into the rear wheel carrier. This bushing is often worn and needs replacement, if the others are also worn.

Warning: This is a fairly big job, and if you replace them, the bolts must be tightened with the suspension in the 'at rest' state, meaning the car either has to be on the ground on it's wheels before tightening, or the suspension has to be compressed to that level. Otherwise the bushings will be in a constant stressed state when not in motion, and may affect ride height & suspension action. This is noted in the service manual but probably ignored by a lot of people.

The subframe bushings are usually shot before all the links need replacement, though.

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