I got the biggest ones I could find. "Partsam Rectangular Red LED RV Camper Trailer Stop Turn Brake Tail Lights White License Plate Light 49 LED . . . " on Amazon. The top screws went right in to the old holes, but the lower ones didn't. I had to plug them up. Yeah, she needs a bath.
The old lights are still in fair shape if anyone wants them for a vintage restoration. You could put LED bulbs in to make them a bit brighter. I'll send them for the shipping cost. I'll even throw in Wago connectors and SS screws. Big rectangular ones, 2004 model.
I have a 2021 with LED taillights and they are not very bright at all. Just a single LED in each one. I've been looking for ones that would fit in the same holes or at least cover the old ones. Did your new lights cover the old lower holes? Can you send a link to these lights?