For sure original and repro angle strips should have punched holes in them although repros can be obtained with no holes. Square not round and 5/16" I believe. You may have to reverse the drilling procedure and use the pre drilled boards as your template instead. Am assuming your angle strips do not have the optional covers that are also available.


Bruce
Old Toy: Ol' Betsy stock 59 Apache SB Stepside (Gone but not Forgotten)
New Toy: 1962 Impala SS Coupe
The Driver: 1990 Toyota truck