Yep - with a Vetter, you take the factory headlight and move it to the fairing.
Most GL's with Vetter fairings still have the headlight buckets attached with the fairings plug wiring tied into the bucket wiring. Rarely would anyone remove the bucket, thinking that the bike might get sold without the fairing someday.
Most headlights were the same size, ...so most trim rings are the same size. Most attach in the same way as another; Honda to Yamaha to Suzuki to Kaw. Within a handful of years of each other.
Jap-bike manufacturers of the late 70's, early 80's sourced much of their components from the same outside sources. Not every little bit and piece was built in-house. Speedometers/Tachometers are a good example. Internally, from one big bike to the next, there is not much difference.