Don't beat me up over the video! I just wanted to quickly show what the grippy seat looks like close up and how it fits and also show what the replacement turn signals look like - no aftermarket LED relay was necessary on this 2018 390.
https://www.youtube.com/watch?v=4M4V69cK5MU
https://www.amazon.com/gp/product/B01LX ... UTF8&psc=1
by the way, if you change out the turn signals, don't cut the wires! Remove the rear fender and you will find quick disconnects for the stock lights and the new lights I bought have male connectors on them already. They are a little undersized but gently squeeze the bike's female connectors and you'll be fine. Don't forget to put heat shrink over all the connectors. 20 minute job to do both rear turn signals.