If you know the number you can get a Sams from John Kendall for $9.00
http://vintage-electronics.com/
If you don't know the number he can look it up by model number.
eBay is another place to get one for cheap.
As Electronic_M explained above you could find out which tube is the vertical output from the tube chart and start there, one of the Electrolytics is probably also part of the vertical circuit so that would be a good one to start with.
The set is so simple it can be completely recapped in an hour or two anyhow.
The .0039 is probably close enough, depending on what it does, if it's part of an oscillator circuit (Vert or Horiz) it might throw it far enough off frequency that it can't be brought back in sync with the adjustments given, you won't know until you try.