The bulb is 5/16" or .3125 when I compress it a bit.
The T is 3/16" or .1875.
The windows were originally mfr'd by MI Windows and Doors
I've attached pictures and want to be sure this matches to your .187 T-Slot Foam Filled Bulb Weatherseal.
PS - your website is excellent! Glad I found it so easily by simple search on Google.
