Solar: What model of blocking diodes??

WindyNation has a great FAQ on replacing a faulty blocking diode on a solar panel, yet they do not mention with what model or even what specifications the diode should be!
I have (twin) 100W poly panels with the 20 amp PWM controller; what spare part diodes should I purchase? Thank you!

 

Does WindayNation not monitor their own forums?? This seems like a really easy question to answer.

 

I'm not on here too much.
A 10 amp 1000 volt diode will work just fine.
1 for each panel.
Some panels use more than 1 blocking diode.