Ok, don't know who your dealer is, so not intending to 2nd guess their expertise, just pointing you and others in the right direction. Ohlins makes 2 shocks for the Panigale, the older TTXMKII for the 1199 which are being discontinued (some distributors might still have some in stock, but unless it's on sale there's no reason not to get the new one) and the new TTXGP which is being released now. The TTXGP has two different versions for the Panigale, one spec'd for the 899 and one for the 1199. The difference is the spring rate and valving, with the 899 version being designed for the progressive-rate linkage that is stock on the 899 (with softer spring rate and valving), and the 1199 version being designed for the flat-rate setting for the track on the 1199. They are identical in dimensions and components, it's only the valving and spring that are different, so either will mount up the same way. Make sure that if you're not changing the linkage to the adjustable setup from the 1199 that you're getting the 899 version of the TTXGP so it's valved correctly and has the right spring rate for your bike. I know many dealers (not sure about yours) are not very familiar with all of the new Ohlins stuff and will just order a "Panigale" shock from Ohlins, which will probably result in the 1199 Panigale model shock being installed. Just worth a 2nd ask with your dealer to make sure they are aware of the 2 different models now and are getting you the correct shock. If they do racing/track stuff they probably do know, but just in case!