Chore Horse power cables?

[BCA]

This power cable set: ZA/CAN 9682, Connectors, twin, 6-ft, 3/4 in., No.C1, packed Sept.1947. May be a Chore Horse accessory or perhaps #19 set? Or perhaps for the CPP-2 Power Supply? Any one with an accurate ID? The clips are 25 Amp Mueller Universal No. 24A. The clip on the red positive cable has a “+” cut-out to identify it as positive. The other clip has no cut-out.