Just find something rectangular that's tan or brown with no markings and the same size. If it's yellow it will have a polarity marking on it (with tantalum that's the opposite of the convention of stripe on negative) and could catch on fire if attached backwards. If you have to buy some try to get a range of values like 0.001mF = 1nF, 0.01mF = 10nF, and 0.1mF (ceramic caps have relatively high voltage ratings so you won't have to worry about that).
BTW that soundcard is 32-bit PCI, not PCIe. And Realtek bought Avance Logic which is why all their sound chips still start with ALC.