Hi steelman23, thanks for asking, no matter publicly or privately.
And Clint, thanks again for your kind help everytime! You're always our warm hearted Eonon user! :thumbsup
Yes
E1026U is not specially for your Corolla like
E1055. Here are they installation size:
E1055:
Height: 136mm
Upper Width: 248mm
Lower Width: 230mm
E1026U:
Install Size: 180(L) mm ×160(W) mm×100(H)mm
So if you want to install E1026U, you may need to do some extra modification with a dash kit. It's possible as long as you are good at techniques or ask professional help.

Some other customers has made it successfully.
E1026U already has USB port, but you will need a iPod adaptor. And without steering wheel control. But it has dual zone function.
Actually, is steering wheel control is one of the key factors to you guys? If so, E1055 is a better fit.