When I did this, I could not find anyone who made a larger supply line mounted in the factory sender.
I removed the factory 3/8 line, and fabricated a 1/2 line bent to the same image. I used a jewelers torch to braze it in the opening. The filter sock WILL slide over the 1/2" line. The mounting flange is pretty thin, so don't get it too hot if you do this.
I epoxied the sending unit onto the 1/2" line in it's same removed position, and it's still working to this day.