I spotted this on the tool launch page for the DWST08017 Toughsystem to Tstak adapter - looks like it may play with the non Tstak organisers too : r/Dewalt

DEWALT TOUGHSYSTEM 2.0 Adaptor DWST08017 - Acme Tools

DeWALT TOUGHSYSTEM 2.0 Adaptor (DWST08017-1)

DeWalt tstak to toughsystem adaptor

DEWALT® TOUGHSYSTEM® 2.0 Adaptor

DEWALT Adaptor Plate for TOUGHSYSTEM 2.0 DWST08017 - The Home Depot

DEWALT® TOUGHSYSTEM® 2.0 Adaptor

DEWALT® TOUGHSYSTEM® 2.0 Adaptor

DEWALT Adaptor Plate for TOUGHSYSTEM 2.0 DWST08017 - The Home Depot

DEWALT TOUGHSYSTEM 2.0 Tool Storage Adaptor, Connecting DEWALT TOUGHSYSTEM 2.0 products to DEWALT TSTAK (DWST08017) : Tools & Home Improvement

Connect Tough System, Tstak, Pro Containers, and tough cases! Dewalt DWST08017

Connect DEWALT TOUGHSYSTEM 2.0 Products to TSTAK Modules, Pro Organizers, And TOUGHCASE Sets