The screen attaches to the bottom of the tank. Look in the area above the right rear axle. You'll see a couple of hoses going into a cutout at the bottom of the trunk floor. The location means you'll have to drain the tank... voluntarily or involuntarily. Also requires something like a 40mm socket or dexterous use of channel locking pliers. I'm not sure if gaskets are involved.

Sixto
95 S420
87 300SDL