Same setup here, love it

Sooo I totally get the struggle! When I first got my UX 300e, I was literally obsessed with keeping that sonic chrome paint pristine, but the road grime was a nightmare. I actually went through this exact dilemma because the EV's underbody is slightly different due to the battery pack.

IIRC, I decided to pull the trigger on the official Lexus OEM guards. Honestly, they're kind of pricey but the fitment against those plastic wheel arches is basically perfect. I think some aftermarket ones might leave gaps where salt and gunk just sit and rot your paint, which is a HUGE no-go for me. The OEM ones used all the existing factory holes, so zero drilling!

They aren't massive, so they don't look bulky, but they DEFINITELY cut down on the spray hitting the lower doors. I mean, they aren't magic, you'll still get some dirt, but it's way better than nothing. Worth it for the peace of mind imo!! gl!

Be careful with those cheap-o aftermarket options you see on eBay... seriously. I've been working on Lexus models for over a decade and the biggest mistake I see owners make is trying to save a few bucks on universal splash guards. The UX 300e has a very specific aerodynamic profile and those high-voltage battery casings sit pretty low. If you buy something that requires drilling or uses generic clips, you risk compromising the corrosion protection on the inner wheel well or, even worse, nicking a harness. Plus, some of those bulky aftermarket ones actually trap grit and salt against the plastic cladding, which basically grinds your paint away over time.

I would suggest sticking with the genuine Lexus OEM ones, even if they're pricier. I've seen way too many DIY disasters where people try to force a fit and end up with rattling parts at highway speeds. The official ones are designed to use the existing factory mounting points, so there's zero drilling involved—total peace of mind for your warranty. Honestly, they might look 'sleek' (aka small), but they're engineered to deflect the specific spray patterns of the UX without ruining your range with extra drag. Just make sure to clean behind them once a year during a deep wash to prevent any gunk buildup. Tbh, it's the only way to keep that paint looking sharp long-term without risking the safety of the underbody components. Better safe than sorry when dealing with an EV! gl!

> "I’m trying to decide between the official Lexus OEM parts and some of the aftermarket options I’ve seen on sites like eBay or Amazon."

Similar situation here - I went through this exact same headache last year with my 300e. I’m usually pretty stingy and wanted to save a few bucks, so I actually ordered some generic ones off eBay first. Big mistake! When I got under there, I realized the clearance near the battery tray is highkey different from the standard UX. I was so worried about blocking airflow or rubbing against the casing that I just couldn't bring myself to install 'em.

In the end, I bit the bullet and just went with the Lexus ones from the dealer. Honestly, you can't go wrong with the OEM stuff if you care about the long-term paint health. They’re pricey, sure, but they literally just pop into the existing holes. I mean, ur paint job costs way more than a set of guards anyway, right? It's basically a value play. They don't look as beefy as the aftermarket ones, but they've kept my lower panels way cleaner through the winter sludge. Just be careful with the clips, I broke one being too aggressive lol. Hope that helps!

Would love to know this too