I've found C and H surplus here in California to be an excellent source for
all kinds of semi-exotic parts ( like capacitors ) for old Tek and HP test
equipment, old computers, Tesla Coils and Ham Radio gear. Their link is
below and they have a great catalog they'll send you for free. If you call
them they will do there best to help you and not just try to get you off the
phone. They are located in Pasadena and will ship to just about anywhere (
except the International Space Station ).
Best regards, and good luck, Steven C.