OK so I own a Pelican 1600, when I bought it it had the Foam Insert and that is long gone.
I was looking to replace it with the Divider Insert Set, but it looks like I might be better off buying a new case with Divider Inserts and sell of an empty case. I guess I could keep the second case, but I really don't need two.
These are BH prices ...
Pelican 1604 ( 1600 + Insert ) $179
Divider Insert Set For Pelican 1600 $127
1600 - No Foam / Dividers - $124
If I sold my 1600 for $60 the new 1600 with inserts would cost less than the inserts.
My other thought is to have two Pelican Cases, the 1600 and buy a new 1510.
I love Pelican Cases, they are damn near indestructible!
I gotta figure this out so I can place my order tomorrow morning.

