After prowling through the EMERS Tels for the WS No 19, I'd venture to say that any headgear assembly with a snatch plug would be compatible with the 19 set.
These include:Microphone & Headgear Assys No.1 CDN, No.2 CDN, Canadian Type 10, and No. 8 Canadian.
The assy which you queried is listed in the Equipment Issue Scale for the "Installation Kit W/S CDN No. 19 Truck and Ground", so it evidently was meant initially for 19 set use.
HTH.
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