Fender extension fillers

[Wallington]

A quick rundown of the inner fender extension filler plates over the years.

1970-74
#479094 RH / #479095 LH.
Short strengthening rib pressings. Full main rib-pressing. 4 holes only. Full-width bottom fold with strengthening pressed over corner.
No stamped GM part numbers or details. Reproduced.

Firebird 70-74 fender extenion fillers rust treated 479094 479095 (2) by Ben, on Flickr

70-74 Firebird fender filler extensions used 479094 479095 (3) by Ben, on Flickr

70-74 Firebird fender filler extensions used 479094 479095 (2) by Ben, on Flickr

70-74 Firebird fender filler extensions used 479094 479095 (9) by Ben, on Flickr

1974-76
#547419 RH / #547420 LH.
Pressed strengthening extended. Full main rib-pressing. Clearance holes for fender-radiator support bolts, smaller holes to secure directly to radiator support. Full-width base fold has become outer-end single tab mounting to fender base.
Used GM-only, not reproduced.

Firebird 74-76 fender extension fillers 547419 547420 (1) by Ben, on Flickr

Firebird 74-76 fender extension fillers 547419 547420 (2) by Ben, on Flickr

1977-78
#10000818 RH / #10000819 LH.
As per above style. Full main rib-pressing. Lower folded bracket has become central single tab mounting to radiator support.
Used GM only, not reproduced.

Firebird RH 10000818 fender extension filler (5) by Ben, on Flickr

Firebird RH 10000818 fender extension filler (4) by Ben, on Flickr

1979-81
#10007269 RH / #10007270 LH.
As per above, central mounting tab only but full main rib-pressing now half-rib, flat at top to match 79-81 inner fender removed rib-pressing.
Used GM only, nor reproduced.

79-81 and 77-78 comparisons.
Inner fender extensions powdercoated 79_81 10007269 top 77_78 bottom 10000819 by Ben, on Flickr

Firebird fender extension filler plates 77-78 10000819 79-81 10007270 LH (2) by Ben, on Flickr

79-81 Firebird fender extension plate powdercoated 10007270 (1) by Ben, on Flickr

79-81 Firebird fender extension plate powdercoated 10007270 (3) by Ben, on Flickr

1980 Assembly diagram modified from earlier years by alteration of lower central tab but maintaining full rib pressing in pic.
Also removed, 1 of each top fasteners, leaving plate held in place by one screw into radiator support and one at base into radiator support only. Production line seems to have ignored this, even on low-mileage original vehicles, keeping 2 bolts through the lot, washers over the clearance holes meant to sit over them, no screws into radiator support, plus single bolt at base tab. Instead, line up inner fender and filler plate by inserting rubber hose into the smaller holes matched on both until bolts tightened.
1980 Firebird fender extension filler panels diagram by Ben, on Flickr

[apfstg]

Some complain but this is why I have to look every day - my questions answered without asking ! Soon I will have no left over parts!

[Wallington]

Feel free to ask anything, I have extra information I can add or others may know also. Like I mentioned, briefly, the diagram assembly doesn't seem to match what was done in practice, based on low mileage original cars and used plates with many years worth of bolted-up wear or underbody spray patterns and uncut threads.

[Wallington]

This is the typical install version, and small holes for self-tapper screws into radiator support not used. Large central clearance hole doesn't seem to have been used on any models. The pressing was even there on the originals, minus the hole.

77-78 RH-side 10000818 full rib to match inner fender

Firebird RH fender extension plate 10000818 installed (1) by Ben, on Flickr

Firebird RH fender extension plate 10000818 installed (2) by Ben, on Flickr

79-81 LH-side #10007270 half-rib, flat top to match inner fender

Firebird LH inner fender extension 79-81 version 10007270 (1) by Ben, on Flickr


Bare 70-74 #479095 panel vs black 77-78 #10000819 panel.

Firebird fender fillers LH 70-74 479095 77-78 1000819 (3) by Ben, on Flickr

Firebird fender fillers LH 70-74 479095 77-78 1000819 (4) by Ben, on Flickr

Firebird fender fillers LH 70-74 479095 77-78 1000819 (2) by Ben, on Flickr

Firebird fender fillers LH 70-74 479095 77-78 1000819 (1) by Ben, on Flickr

How each bolts up at base, 78 radiator support shown.

Firebird 78 radiator support cut and fender filler mock-up LH 10000819 (1) by Ben, on Flickr

Firebird 78 radiator support cut and fender filler mock-up 70-74 479095 (1) by Ben, on Flickr