It does not fit all 450SL, 450SLC, 450SE, and 450SEL models. Some had a single-hole accumulator. You MUST remove the FID cover and inspect it before ordering.
If you are installing our NEW injectors, these wires are a good option if your old wire plugs are rotten and breaking up. These will need to be wired into your existing harness.
Part of Kent's $8 troubleshooting and repair video collection. The video will only cost $8 but you could save $ hundreds and much grief by watching this video.