Most probably you can get one US pan in Europe, without having it shipped from the US as the Akra racing exhaust is available in Europe too, hehe.
The 60mm diameter is the same as the 1299, but most probably you will need a remap specifically for the 959. However, will it be compliant with the Euro 4 if you adapt a 1299 aftermarket exhaust?? :S
If Ducati hasn't been able to do it...