Found out yesterday that someone from Down Under is repopping the old stlye ARD belt drive magneto housings to fit unit 650 Triumphs. These castings look damn near identical to the originals. The kit I saw comes complete, minus the Fairbanks-Morse mag that you have to supply. Two different vendors had these for sale, so this might be old news to some. Price was around $275 if I remember correctly.