I dont have dimensions or a template as my truck is currently torn down, but I found these pictures from a 38 fender I have in storage. I believe they are the same, hope it helps.
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20250617_140609 (Large).jpg (183.3 KB, 55 downloads)
20250617_140640 (Large).jpg (147.99 KB, 55 downloads)
20250617_140645 (Large).jpg (150.06 KB, 56 downloads)
20250617_140647 (Large).jpg (108.12 KB, 56 downloads)
20250617_140650 (Large).jpg (98.65 KB, 56 downloads)