Have the same problem(s) here trying translate between them.
I have alot of boards I have to keep going and would be nice if I too could "Know" what solid cap is equal to/the same as a dielectric cap.
However replacement caps should be easily found on fleabay, I bought a 200 count bag of 3300uf 6.3v caps for my older boards last year fairly cheap on a cost per cap basis and I see them all the time in different sizes, both solid and dielectric styles.
I know the 820 is it's uf rating and I will say it can run one that's rated higher based on it's uf rating and be fine, you just want to keep the cap's voltage rating the same. However don't go too far beyond the stock uf rating, anything that's close but not below the stock uf rating will do if that's all you can find.