James, the one spring clip is definitely installed upside down. Compare the spring clip orientation in the picture where you're holding it to the picture immediately above it. It also appears that both pins are not driven in completely. Normally the pointed end of each pin protrudes from the caliper approximately 1/4". Use a punch to seat the pins completely.

Recommend buying new/rebuilt calipers from your local MB dealer so you're using high quality parts.

__________________
Fred Hoelzle