The fronts, yes. The rears are regular 124.
Where the fronts have a significant flare, easy to see, the rears also have a larger flare, just not as pronounced.
The part numbers are all different on these body panels and bumpers between an E500E and any other model 124.
Looking at this one picture of this wreck doesn't show the difference very much, But park a 500 next to a 400/320 and looking then, the difference would be apparent.
Also, have you gone through any of the build threads like bahnstormer's, where they are making a coupe or a non-500 look like a 500? They always enlarge the rear flares, copying the 500. The rear bumpers on the 500's are wider at the tips to conform to the wider rear fenders on a E500E.
I own a E420 and a 500E, so not just from internet pictures. Right now my newly acquired 500E is at Victors in the Bronx, getting the electrics and some mechanicals restored. When I get it back I'll put up some of my own pictures.
In the meantime, here are front and rear pic's I found on google, that show the fender flares better. Aero I