The official Realtek package includes both architectures. When you install via Device Manager, it will automatically choose the correct .inf file. No need to search separately.
If your hardware ID shows Ralink:
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Do use "driver updater" software. Instead, use these verified sources: The official Realtek package includes both architectures
Even with the correct link and driver, you may run into issues. Here’s how to fix them. nextep ne510 driver windows 7 link