Keypad membrane switch for PCB???

Hi all. First off thanks in advance for any help or suggestions you may give. What I need help with is making a 4x4 keypad overlay work again. I have the overlay and the PCB, all I need now is a device that connects to the PCB that senses the push of the key. I looked at membrane switches but they all seem to come in a certain size that you can not change or cut. Ideally what I need are individual sensors that I can put under each key so I can space them just right. It doesn't even have to be a membrane switch, just some kind of sensor I can put under each individual key in my overlay that I can connect to the PCB. Any one who can point me to a place where I could buy what I need or even just suggest what I need I would greatly appreciate it. Again, thank you in advanced.

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