HP-67 tantalum capacitor: where to buy it?

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Hello,
It seems that I have to change this component because my HP writes but doesn't read cards.
HP-97 schematics didn't help so much because capacitance (6,8 uF) is mentionned but voltage is missing.
On the other site I found this:
TANTALUM CAPACITOR 6.8uF 6.3V M39003/01-2002 CSR13B685KL 5910-00-936-1331 5PCS
with the lowest voltage possible.

I am not an electronician, how to be sure that specifications are correct?
Furthermore this old component seems to be hard to find (I'm living in Brazil). OK, I own some old defective models (Comodore or so) I could canibalize, but researching for the good part should be tricky.

My HP-67 is from 1980 (edited), the component to replace is blue & red with two black little spots.

Thanks in advance.