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L4 Rear seat bottom size

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De rode ridder

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According drawing 50361 the rear seat bottom plywood measures 1/4" x 15 1/4" x 18". That seems small. If I compare this with drawing 50503 rear seat installation and 50861 rear seat cleat, the width should be 24 ?/8" (can´t read the exact figure)
This would mean that that the actual plywood would be much smaller then the cleat,.... meaning the cleat sticks out a lot on both sides of the bottom.
The seat installation drawing doesn´t show this and when I look at many L4 pictures either. Is the dimension of the rear seat bottom drawing 50361 wrong????
Either way, the 15 1/4" x 18" looks small. It would fit on it but probably won´t in 20 years:D.
What is wrong here?

My question; what is the correct size of the plywood?
something like 18"x23 3/4"????

I can´t read the hardware listed on 50503 either. What type of screws, nuts and washers did you use for attaching the channels and cleats???

View attachment 50361.pdf
 
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