T slot with bubble.bubble diameter 3/8 inch, t slot also 3/8 inch. Windows are 25 and 29 inches wide (length needed if replacement strips).
Emily from SWISCO responded:
September 30, 2022
Hello there!
Your weatherstripping reminds me of our 58-183 but your dimensions are a bit off from ours. You may want to double check them to see if this part matches up.