Came across this on VisroDown
(although I guess they should sell something compliant with the Racing AKra)
Not sure if that means you can make due with an EU-spec 1299 belly pan, or if you need to try and get a 959 US spec pan shipped over.The good news is that a 1299 Panigale’s exhaust will fit the 959, meaning you might be able to find a keener-priced replacement than buying new from the factory. However, unfortunately you won’t be able to swap it without also replacing the 959’s belly pan, which on the EU-spec 959 is different to the US-spec 959 and 1299 models.
(although I guess they should sell something compliant with the Racing AKra)