My educated guess ... red reflector required on the rear.
That’s exactly what the statute says…
316.415 Reflectors.—Every motorcycle and motor-driven cycle shall carry on the rear, either as part of the taillamp or separately, at least one red reflector. A violation of this section is a noncriminal traffic infraction, punishable as a nonmoving violation as provided in chapter 318.
I’m getting ready to register an old dual sport after a restoration and I got a set of those license plate bolts that have reflectors. Rule doesn’t specify the size and only addresses the rear. A buck and a half down at Autozone for them. I’m hoping that’ll be okay if DMV decides to inspect.
Many of the sporty crowd yank those enormous reflectors on the front forks. I haven’t, but the way they say they do it is put heat on ‘em with a hair dryer and drag fish line behind the reflector.