[C10 - C90 Bill]

Pretty good drawing in my opinion.

I'm well familiar with both of those fenders, but just wish I had a set here to measure for you.

To go into more detail though, some Mediums had the Wide Fenders and some Heavier trucks had the Narrow. Also I don't believe the Narrows were out till '63. You may want to ID them as Narrows and Wides instead of Mediums and Heavys and verify them with pictures, even though the measurements themselves will prove which is which.

Keep us posted on your project.