like Ned says, 1 litre will cover the two - just. 120mm or down to 115mm 'air gap'. 5w oil.
I do a superb fork sdeal called SKF. given that you are from SKF's home country I'd hope you have a very good chance of finding them there. if not I have them on ebay. something like "Husaberg WP48 SKF fork seal kit".