I believe the strips would have been made of dense cloth like material, certainly not wood. I think some of the vendors (Jim Carter's or Filling Station) would have have them or you could use roofing felt (30#).
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix