Can I install 2002 or later mudflaps/trim on an earlier model?

Yes you can install 2002 or later mudflaps on earlier models. The mounting method differs, so you'll most likely need to drill new holes. You might consider also getting the plastic trim piece that the front mudflaps mount to which is both compatible and pre-notched for larger tires. If you have 32+" tires, you may still need additional trimming.