[Milsurplus] Mica capacitors?

[Dean L Kellogg, Jr.]

Pardon my rookie level ignorance, but I need help 
with replacing a 0.003µF, 800 V mica capacitor 
from a BC604.  One of the connecting wires broke 
off flush with the plastic capacitor body.  I 
have looked on the internet and have had trouble 
finding mica capacitors of that size (or at 1000v 
for that matter).  I have found 1600 Volt 
Metalized Polypropylene Film Capacitors.

Would these do?

or "orange drops"?

Do I have to use mica?
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