1998 2500 box/bed bolt size - ?!

Hi all! I'm wondering if anyone out there knows what sized bolts GM used in 1998 to attach the box to the frame. The dealer I phoned couldn't find it
listed in his parts catalogue.
Thanks in advance! Ron
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com 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.