I am not sure about the T55 window series by Thermal Gard. However SWISCO does carry replacement parts for Thermal Gard windows
. Thermal Gard windows uses parts that only fit their windows and generic parts that fit many different brands of windows. I would also check with a local glass company in your area to see if they will replace the glass in your Thermal Gard windows before you purchase any replacement parts for your windows. If you need help identifying the replacement parts you need please reply with pictures of the parts you are looking for.