Need help finding a laptop sata cable for my dad

You could take the laptop and SSD into your local technology/computer store and ask for some assistance? I'm not sure what you might have near you, but in New Zealand PlayTech and PBTech are super helpful with these sorts of things. If they don't have what you're looking for, they'll generally order one in for you, or at the very least tell you that what you're looking for doesn't exist.

Best of luck, and happy birthday to your dad!