I have a nice older Plano case (about 11"x51" interior dimensions) and I wanted to find a replacement pick n pluck foam insert but I don't know who sells this stuff. I have called Plano and they no longer support this product. They have referred me to Cobra Foam and their Customer Service was
Apache Hard Case 5800 Replacement Foam Insert (2 Pieces) — Cobra Foam Inserts and Cases
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WTS OR - ShivWorks Clinch Pick
Foam is die-cut into one inch squares An easy do-it-yourself system for customizing the interior of you Pelican case Contents stay in place and get
Pelican 1450 3-Piece Replacement Pick N' Pluck Foam Set (Grey)
Help keep equipment safe to your specifications with the Pelican 1052 Pick N Pluck Foam Insert For 1050 Cases. It's an easy, do-it-yourself system that helps you to custom-shape the interior of the case according to your equipment. The foam of this Pelican pick n pluck foam insert comes in layers that are pre-scored in tiny cubes. Simply measure your equipment, use tape or chalk to mark the foam and then pluck away at it.
Pelican 1052 Pick N Pluck Foam Insert for 1050 Micro Case
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WTS OR - Reload ammo boxes - Cardboard/foam inserts
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Charcoal Pick and Pull Grid Foam
Pelican 1052 Pick N Pluck Foam Insert
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Pelican 1022 Replacement Pick 'N' Pluck Foam Insert #1020-400-000