This is a great kit for you early SL and SLC owners. Fits all 450SL, 450SLC, 380SLC, and 380SL from 1972 to 1985. If you are getting a lot of body roll in the turns this kit will really tighten up the front sway bar.
Early 107 SL and SLC Meyle Front Torsion Bar Mount Kit
$48.75
SKU:
RGR-107FSBK 
Product Details
Comes with all rubber and hardware as shown. Sorry no instructions but this is an easy and straightforward replacement. This kit lists for $92.00
You might also consider replace the front subframe mount rubbers at the same time. Look below in related products.
Related Products:
$84.50
All R107 C107 Chassis Complete Front Subframe Mount Kit
This is a MUST DO replacement if you want the original feel of a tight front end on your 1972 to 1989 107.
If the front end of your W107 SL or SLC convertible or coupe wanders on the road or thunks when you go over railroad tracks, you most likely need to install a new front subframe bushing kit. I see this condition even on real low mileage pristine cars.