The glow plug relay is a black box about 1.5 x 3 x 4 inches on the left inner fender. Pull off the black plastic cover to see a couple of connectors and the strip fuse. Maybe a big power cable also.

At the front of the engine there's a small shock absorber. A couple of inches to the driver side of the upper attach point of the shock absorber is the upper perch of the spring. The lower perch is about 8 inches directly below, at the end of a lever opposite the lower end of the shock absorber. Takes about 5 minutes to fit a new spring including the time it takes to open and close the hood.

Sixto
93 300SD