Is this actually 3/8 size? I have ordered some of these from my local Anderson dealer and they come in at 5/8 and don't fit quite the same. The ones I have now have 3/8 stamped on them.
Paul from SWISCO responded:
August 11, 2015
Our 55-303 Andersen glazing is for 3/8" insulated glass. What is the size of your glass?