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
Pelican 1020-400-000 1022 Pick N Pluck Foam Insert for 1020
The Pelican 1171 Foam Set is a replacement polyurethane foam for the Pelican 1170 Case. The set consists of one convoluted top lid foam, one Pick 'N' Pluck foam, and one 1 smooth bottom foam.
Pelican 0371 Replacement Foam Set for 0370
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)
1050 Micro Case Pick-n-Pluck Foam Insert
Pelican Case 1470 1471 Replacement Foam Inserts Set (1 Piece)
Pick N Pluck Foam / Replacement Inserts
Pick N Pluck Bottom Foam Insert – Fosco Connect
Plasti Dip of pick 'n pluck foam - Equipment (No astrophotography) - Cloudy Nights
Pelican Pick N Pluck Foam Insert 1622 (Set of 4)
HPRCCUB2500, CUBED FOAM KIT FOR HPRC2500 - HPRC
Charcoal Pick and Pull Grid Foam