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Lots of shops have made them, they come in 3 diffrent lengths. Not too hard to make but they take time and thus can cost a fair anount of money. Rubber is not cheap either. It’s best to fit the boards to the car as often fenders have been modified and thus a stock board more often than not won’t fit.
The only source I found that reproduces the original rubber pattern is in Canada. Kris Arneson did beautiful work on my 1703.
Rock Auto stocks rubber mats in 36″ x 36″” and 36″” x 72″” sizes.
They have pieces with 4 ribs per inch 8 ribs per inch and 1/4 in wide ribs.
This may be another option for us.”