I have replaced the mount on my wife's 84 SD once a long while ago, many years actually, when it cracked and broke. When it went bad that time I cut a piece of 1/8 inch steel with a plasma cutter, and mig welded the spots that I considered weak. I didn't take pics, as that was before I found this group. I remember making a plateand using bits of steel Mig welded over the crack spots. I'd say that might be 8 or 10 years ago, and all is well, still. I think I did the rubber bits once again, since then. The thin sheet metal was inadequate for decades of vibration.

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85 300TD FED-Daily
84 300SD-Wife's
86 XJS-Sunday
66 GMC-Work- Given to my stepson
83 BMW Airhead- Given to my stepson