I have a dozen (12).
Mallory rotator start capacitors.
Mount inside the rotator control boxes.
For most rotators, Ham-4, Tail Twisters, U-100, etc,
About 2" long by 1-1/4" diameter.
Solder posts also accept slide-on connectors.
Four (4) for $26.
The standard size spray paint can is for size comparison.