[Heathkit] Stupid Question about Capacitors for HO-10

[OTAKEBI at aol.com]

My capacitors for the HO-10 just came in from Mouser.
I bought the .15 1600volt CDE HV Metallized Polypropylene Film type.
Problem is that the capacitors have no polarity markings.
I have never used these before and maybe polarity does not matter.
Or, maybe there is a way to check with a meter that I do not know about.
Can anyone shed some light on this?
Dan/N4VET