Window Seal Identification
Hello! I'm very confident that we can supply a match for this weatherstripping, but I'm not sure where to begin. It appears that your bubble seal is torn up a little, which ordinarily isn't a big deal, but in your case it seems the most important part of the seal has torn away: the piece which installs it in the window.
Do you have a sample that hasn't been damaged? If so, I'd like to see it. You mentioned that it's a "T" slot, but there are actually a couple different kinds of that one style. Seeing an undamaged sample would be a huge help for us.
Based on your sketch here, it looks like your weatherstripping is the same style as our 58-171 or 28-182. However the size of the "T" isn't the same. 3.5 mm comes out to approximately 0.14", or a little over 1/8". I would double check that dimension just to be sure.
Knowing the window manufacturer won't really help, unfortunately. Most window makers use generic weatherstripping. The only thing that can help us ID a match is a clear idea of the shape of the end profile and its exact size. There is no other way.
