None of the cars I saw nor mine were cracked at welds. All cracked at the seam of the horn to the frame (horn is spot welded), at the vertical junction of the horn as it bends to meet the frame, or at the base where the 1/4 inch plate sits in the horn just above the mount.

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I don't know the same things that you don't know.

Shayne

85 W126 SD OM617.951
87 409D 650S OM617.913
93 E34 Touring M50B25TU
02 E46 Sport M54B30TU