I mentioned before I used a URO seal on my 300d front glass two years ago. I’m satisfied with the result.
It was not as beefy as an OE. But it does fit and seal. My biggest complaint is because of the lacking thickness it fits a little pulled back on the body and exposes the masking line on the old respray job. Obviously the older one was wider on the margin.
However, given this was the one available at peach and it was inexpensive I’m okay with it.
Sad to hear above the 126 one didn’t fit well. I fixed my 126 with an OE rear glass seal about six years ago. It was very thick and heavy. It’s still pliable and fresh. It did cost significantly more than the URO if I recall correctly.