Contact sensors for windows

I would like to setup my contact sensors with two limits: one with window completely closed (normal setup) and the second one with window open 6 inches. I like to leave some windows open for 6 inches at night. Do you know where I can but the only the small part of the sensor? I want to install it 6 inches away from the closed position, then open the window until it makes contact, them set the alarm in home mode. Thank you.

Buy a “slim” magnet for $5

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Do you know where I can buy them from? I searched though Amazon and I could not find something similar in shape.

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Ring has them at:

But Ring does have a minimum $ purchase for free shipping - so you will probably have to pay shipping on top of the $4.99

Put 1 or more in the cart to see what the shipping $ would be

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