I've never installed that particular brand light kit on a Yamaha G29 but it does have good reviews. Some guys say they had to fab a mount for the brake light switch but others say the included mount works well if mounted like the instructions say. Let us know how it works out after you install it.
A little late but install went well last summer. It is STRESSFUL cutting a hole in a perfectly fine golf cart!
I purchased the RecPro deluxe LED street legal light kit from Golfcartstuff.com. I read a couple reviews that golf cart stuff was unresponsive when people reached out to them, so I actually purchased these through their amazon store. When I reached out to them for support on the brake light switch I expected to have to wait a few days before I heard a response. It was with in a couple of hours and they got back to me. They actually took the picture I had sent & drew where the bracket should go. Great price & they were great to work with.