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Just Google it. There's plenty of them on-line that you can download for free. You're looking for a *.pat file specifically. Those are what Revit uses to create a its Model and Drafting Patterns.
try this site: CAD Hatch
http://www.cadhatch.com/free-downloads/4588167679
or you can load the pyRevit application:
http://revitaddons.blogspot.com/2019/01/pyrevit-v4610-4611-upcoming-pyrevitlabs.html
Using pyRevit you will be able to customize your pattern very easy..
Constantin Stroescu