Welcome @Milwaukitrilitrounce. I was wondering this as well and can't find any details on Serial 1 accessories, aside from a mention that "Harley plans to sell a vast catalog of aftermarket accessories". Deliveries will happen this summer so maybe shortly after then?
Any other accessories you want? Interested in other e-bikes as well?
The sophisticated commuter. The RUSH/CTY model is a premium, full-featured eBicycle designed for more convenient and fun commutes. The easiest, most intuitive way to get anywhere, without breaking a sweat.