You could start by fixing the broken links. Always verify your links after you post. FWIW, the DigiKey link looks like a query that’s going to return thousands of parts, not one device.
If you have Mega with a display shield plugged in, where are these parts that you need to bring 5 volts to? Just trying to understand what you’re attempting to do. Please explain so people can provide a response without having to make assumptions.