The 16-in spools are probably for use with a drum barrow.
That backpack unit is an Apparatus, Cable Laying, No.6A and takes the standard WW2 reel (also usable with the wooden frame ACL No.2 and Bars, Carrying, Lightweight).
If you've got cloth covered twin (twisted) telephone cable, that's definitely worth keeping since it was obsolete in the 1960s - it would be D3 or D8 and was all replaced by the plastic covered D10 (or American equivalent (WD-1?)).
The later reels have a larger spindle and will not fit the WW2 backpack or hand cable laying equipment.
I'll see what information I can find.
Chris.
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