A/C box gasket material - where to get?

Does anyone know where I can buy just the 1/4 round gasket material that goes around the a/c box? The kit I bought is short and I hate to open the second kit I bought (by mistake) just for the gasket material. I need about 4 feet total. I tried Home Depot, Lowes and ACE hardware with no luck. Thank you...Gary

 

Glass shop by me had it. Try a local one. Just describe it to them.:TU:

 

Thank you for the suggestion, I would not have thought to try there.

 

I used 3M strip caulk which is close to the original material if not the same

 

Terry is right, I havfe always used strip caulks. Works best. The house type weatherstripping some places sell is not correct.

 

Meant. John/Terry