I spotted a Bitubo kit on eBay. I've see some discussion, but nothing absolutely definitive about whether the internals of 2018 forks are different from 2015/16 forks. As far as I know, only the outside is different.
Would this kit work on my 2018 forks?
https://www.ebay.com/itm/Adjustable-fork-cartridge-Bitubo-for-KTM-RC390-15-16/113692621890
Would this kit work on my 2018 forks?
https://www.ebay.com/itm/Adjustable-fork-cartridge-Bitubo-for-KTM-RC390-15-16/113692621890