According to the Crossfire parts manual the NA crankshaft damper (05127600AA) is NOT the same part number as the SRT6 (05166765AA)....
I just checked my original that is sitting in the garage and the MB number is A112.035.15.00 and is dated 23.03.2004.

Try searching for Harmonic Balancer SLK32/C32 or crankshaft damper. MB calls it a harmonic balancer.

Any MB dealer should have this, or be able to get it.

There are after market pulleys, but they are oversize for added boost.... and not cheap...

Good luck.