for 87 SE, looking for lower radiator mount as I have been told it's rusted and that the next big bump could make the radiator get road rash. I'd also need instructions on installing it. Would I have to take the Fiero's nose off or can I get at it from the underside?
Never done it, but having recently swapped noses I can say with reasonable certainty that you can change the lower radiator support from below.
Depending upon what type of nose is on your SE you may have to remove a few pieces which direct airflow up through the radiator, but that's about it.