Go with the Jim Carter product. It comes with the template and instructions so you drill your hole in the correct location. Two of my trucks have his antenna and they are great quality.

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