[morzh]

Just an example of using Mouser:

Let's find an axial 10nF 630V one.
From the Mouser.com page go to "PASSIVE"

   

Then choose "Capacitors".
Without even specifying the type roll down to the search parameters. Use slider to go to the "Capacitance" column.
Click anywhere in it. Type quick (it allows time between keystrokes but it has to be reasonably fast or else it will think you are typing another value) "0.01 u". The "space" has to be there.
It will take you right to the 0.01 uF value.

Then move to Voltage Rating DC column and pick 600 VDC. Also in "Termination Style" pick "Axial"


Then press "Apply Filters" button.

   

You will have the list of the available caps.

The cheapest, $0.59 apiece in qty 10 is this
https://www.mouser.com/ProductDetail/Cor...qUd%2FQ%3D
598-103MWR630K

The datasheet also says that the minimum lead length is 35mm (1.4")