Sash Stop - Milgaurd material

I am looking for sash stop material like this: https://www.swisco.com/4-inch-Sash-Stop/pd/Spiral-Balance-Retainers/55-043

But, using the measurement areas in that link: 1 3/16 wide at the top, and then 7/8 high/deep. I was once able to find long piece of this that I could custom cut and put in my Milgaurd windows to they don't open too far. Now I can't find it.

Ideally, I'd like to buy at least three foot lengths.

Thanks,

Joe