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Click on image for the lowdown. 
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| | | Forums66 Topics128,205 Posts1,057,429 Members48,471 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2001 Posts: 168 'Bolter | | 'Bolter Joined: Sep 2001 Posts: 168 | Depending on who you ask, they are 1-1.5" wider. Not a huge difference. When I compared my 39 fenders to my 40 fenders, I came up with 11.5" vs. 13".
1956 GMC 100 NAPCO Deluxe
1955.1 Chevy 3600 NAPCO
1954 Chevy 3600 NAPCO
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