I purchased and recently installed the Euro signals. I got them from
https://www.motorcyclespareparts.eu, for $250 shipped to New Jersey. Sounds like a lot, but they are OEM and higher end turn signals are not that far off in price. The plugs were different and you can find adapter harnesses but I just spliced on the connectors from the stock signals. They definitely flash faster, but not so fast that you couldn't just leave them but I opted to order a new relay. I tried to order the OEM Euro relay, but apparently it's on backorder so I'm trying this relay as others have used it with success:
Someone on another forum posted VERY detailed instructions on turn-signal and relay replacement:
vitpilenforum.com