Replacement shock absorber rear axle left on the SL500 (R230) year 10/2001

After 1-2 days of service life, my vehicle kicks off on the left side of the rear axle because of a slightly oily shock absorber. Does it make sense to install a reworked shock absorber, e.g. at Ebay or other source in exchange? I drive the vehicle only as a lover vehicle in summer only approx. 5000 km. repair and screw on the vehicle yourself, falls flat with me! At the same time I am looking for an experienced (ABC – suspension) workshop in the Rhineland, (possibly Cologne + 70 km), which costs me the necessary assembly and, if necessary, the procurement of the necessary replacement part, in their workshop. Can the users of my R230 series, who have already been affected by this damage, help me specifically with information (e.g. also expected repair costs for the described scope)?