I have several of these that came to me in an auction lot about 20 years
ago.
Since then , they sat in storage.
All are new and never installed.
4 inches from end bell to end bell.
$20 plus shipping.
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Ron
link is http://my.stratos.net/~w8ron/Transformer288vac_4.jpg
http://my.stratos.net/~w8ron/Transformer288vac_5.jpg