more knock outs

how can i tell if my 1999 silverado has the knockout that need to be removed before an alignment i have read that the trucks with the new body style
don't have them?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.