what kind of door sweep?

I am looking to replace the rubber door sweep for our shower door. The drip rail is fine. It looks like there is a notch on one side to hold the sweep in so not sure if I need a rounded top? I don't think the "T" top would work. The rail is 25 1/2" long. What remains of the old sweep hangs about 1/2" below the door and it measures approx 3/4" in the rail so I guess it should be 1 1/4"? Do you have something that will fit?

I purchased the 10-309 sweep because I needed the longer height, otherwise there would be an opening left. It slid right in the drip rail without any altering!