I checked all the old places I used to get ddr parts from and just found the bare hose with metal box ends that the harness goes in, but no luck on the actual harness. Probably will have to Buy one of those and build the harness. Here is an OLD post I found on the connector type if you want to preserve the existing connectors
All connectors used on DDR Dance stages are JST connectors. JST parts have to be ordered from Japan or Digikey or Mouser in the US. Digikey and Mouser have very limited stock though.
I did that a while back, but I only have the yellow one you are looking for. Male and Female ends and the pins that go in them. I can probably take some time this week to help you out of needed. The connectors are super cheap. I just have tons of spares because you have to order massive quantities from JST.
The 6pin one that does the 12V DC power to the pads I do not have, but I may be able to help you track that down.
The 2 12 Pin ones, Yellow and White, are identical. They are only colored differently to help you know where to plug them into on the cab itself. When I had to redo mine, i just used a yellow sharpie to color in my connector to help tell it apart.
The 12 Pin parts are as follows: -YLP-12V -YLR-12V -SYF-01T-P0.5A (contact pin) -SYM-01T-P0.5A (contact pin)