I just replaced 2 of the 3 filter housing mounting brackets on my 1982 300D.
Those are *****es to replace!
The treads were gone on my bracket, so I had to use some very unusual positionning of my wratchet wrench to hold on to the nut and washer from below. Make sure you have a small ratchet handy in case you need to do this.
1982 300D - <A HREF="http://members.xoom.com/nicodore/