Bad news there bones, but the good part is your injectors were goosed, so did need replacing anyway. When you say the injector washers look good and don't leak, are you talking about the ones at the bottom of the injectors that make contact with the head, formerly copper now upgraded to an aluminium type version ?
If so, they normally come with new injectors, depending on supplier I think.
In any case don't use your old ones for the sake of a few extra quid, they play a major part.
If they leak diesel into the sump after fitting, you could face serious other problems, also have to pull the injectors again to replace
Personally, I would ditch any used parts from your old injectors and buy new.