Just get a 4in or whatever size your unity takes highbeam from walmart or autozone ect. The bulbs are about $4 but my walmart had 5 marked down to $1.25 each which I got for spares. My original has lasted 2+ years.
Also a high beam spreads the light out in a better arc tosee with if you want an extra headlight
I picked up a 5" highbeam, it fits perfectly.
I saved about $12.over Galls. I have not checked the pattern yet, but from what I understand I'm not even supposed to turn it on here in NY.