hardware size?
Thread Starter
Senior Member


Joined: Apr 2016
Posts: 733
Likes: 47
Car: 1991 base firebird
Engine: tbi 305
Transmission: 700r4
hardware size?
does anyone know what size hardware I need to install the front ground effect on a 1991 firebird? I cant find my repair manual and I'm finding nothing online.
Re: hardware size?
The Firebird Parts and Illustrations catalog is in the history subforum in PDFs.
Assuming you mean the pieces in front of the front tires? Double-sided tape across the top, typical metric body bolts to the fender and front bumper... 10mm hex, probably a 6mm thread.
Assuming you mean the pieces in front of the front tires? Double-sided tape across the top, typical metric body bolts to the fender and front bumper... 10mm hex, probably a 6mm thread.
Thread Starter
Senior Member


Joined: Apr 2016
Posts: 733
Likes: 47
Car: 1991 base firebird
Engine: tbi 305
Transmission: 700r4
Re: hardware size?
thanks for the reply. I'm searching for the illustrations catalog. I don't know where the history subforum is though.
Re: hardware size?
Yeah, it's not exactly the easiest book to navigate. Doesn't help that whoever scanned it into the PDF cropped the page numbers out.
You would have to look up the front body parts, or bumpers, or grills. Sometimes the specific hardware isn't even listed. But when it is listed, it's one of a rare few places to find sizes and part numbers.
You would have to look up the front body parts, or bumpers, or grills. Sometimes the specific hardware isn't even listed. But when it is listed, it's one of a rare few places to find sizes and part numbers.
Thread Starter
Senior Member


Joined: Apr 2016
Posts: 733
Likes: 47
Car: 1991 base firebird
Engine: tbi 305
Transmission: 700r4
Re: hardware size?
I'm going to go old school and drive my car to the hardware store and run in and out of the store test fitting until I find the screws that fit. reminds me of my youth when that always what you had to do.



