Correct, the horn covers were only on the 38-45 bikes, 38 they moved the horn above the headlight so it needed a cover on the back, the horn was different and the cover had a flat back, in 41 they changed the horn to the one with the rectangular plate and a tapped center hole and the cover had a rounded back. After 45 they changed from the leaf spring to the girder fork and moved the horn down to the crash bar mount.
Up to 45 leaf spring fork, covered horn
IMG_2569.jpeg IMG_2568.jpeg
46 and up girder fork, no horn back
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As for the orientation of the horn I believe the terminals would be up top.
Joe
Up to 45 leaf spring fork, covered horn
IMG_2569.jpeg IMG_2568.jpeg
46 and up girder fork, no horn back
IMG_2567.jpeg
As for the orientation of the horn I believe the terminals would be up top.
Joe
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