[Boatanchors] Source for HV Electrolytics? (Globe King restoration)

[Les Zwiebel WB6ORZ]

  I am restoring a Globe King 500C AM Transmitter, and want to 
replace an Axial leaded Electrolytic, 12 mfd at 700 (seven 
hundred) V rating. The original is about 3 or 4" long, and 1" in 
diameter. So far, Google is only pointing to a 600V item.
    Any pointers would be appreciated. Tnx in advance.
    Les
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