Frank Payne,formerly from Flying A Restoration in Omaha had the rivits.
He's a member here.
https://www.yenko.net/ubbthreads/show...at=showmembers
Make sure you have the Oval Flat top,and not the round Bubble top,to be original assembly line correct.Also,boxed NOS have the larger holes to accept the replacement service bolts,not for the rivits,as used on the line originally.