Based on your video - the measurement from the base of the bubble to the top of the channel piece is 3/8" tall and the bubble is about 3/8 as well but it could be compressed due to age.
What should my replacement be?
Bob from SWISCO responded:
April 8, 2020
Take a look at our 58-183 to start. Go over the end profile dimensions and see if this matches what you need. Other possibilities include the 58-182 and 58-171. Let me know what you find.