You can buy a 10pF ceramic capacitor at Deeco and Alexan instead of the surface mount capacitor (0805) which the link suggests. The capacitor should have a 10 marking.
For modifications, you can change the output coupling capacitor. However, to be sure what capacitor you need to replace you will need the schematics for that.
For the modification, I would suggest that you PM monreq. He is an expert in this kind of things.