I had a homemade right front turn signal in my bonne for as long as i've owned it, the person before me took clear plastic and made it to fit the original housing, so it looked horrible.
I went to the junkyard to get a new one of THE ONLY 87-91 bonnie in the whole junkyard. So I got lucky. getting it off was hard, but putting it back in without breaking something is impossible.

The way gm put it in is im guessing they put the bumper in then the light housing because the screws for it are smack up against the bumper making it impossible to get to.

I ended up just ripping out the old one hoping stuff wont break then actualy did break the chrome strip along the bottom that holds the regular lights and side markers together.
A stupidly hard job that I don't want to do again.
dh2
But it looks much better. Ill post pics when I get home.