ground effects

Ok, so I'm trying to find ground effects for my 91 corolla. Indeed its very hard to find such parts for this car. Is there anywhere I can go to find the specs for the bumpers for this car? I thought if maybe I compared the specs for the bumpers on it to maybe that of the honda accord or nissan sentra, since the bodies are very close to the same shape and all have the same size engine and stuff. I thought maybe I could look up ground effects on those cars if i knew I could take a bumper off one car and put it on another. Any ideas on what I should do?