I would have to think that someone makes one that will fit. I mean how many differant size circles can there be with 2 holes in it? I would think not many. I know in Md I would have to change the bulb to an amber bulb if i did that.
The turn signals are the same as those on the other boulevards. Consequently, the same clear lens that aftermarket folks are selling will fit. I'm running them on my bikle front and rear. Because I wanted them to appear totally clear when not running, I originally ran the chrome colored amber incandescents in front, and the chome covered incandescent reds in back. It wasn't long before they overheated taking out the bulbs and melting part of the internal lens. Subsequently, I went to LEDs in red and amber as they last practically forever and make hardly no heat at all.
Although I've ran this before, I'll save you the trouble of searching