Searching for 13 2 BX CMC 7

I can't tell if this is what I think it is. I'd guess it's S380-14 or S385-14, but you'd need to measure to check. First, does the metal bar measure 14"? Let me know if not. Second, measure the shoe, the bottom attachment, to see which of the shoes below you have. If you have the 1" shoe, go for Series 380 but if you need the 1-3/32" shoe, Series 385 is the way to go.

Once you pick a part number, you need an "option" to go with it. The option is determined by the weight of the window sash. Your option may be "1320" but you should weigh your window and check. If 1320 is correct, your window would weigh between 6 and 9 pounds.