Many thanks for the replies to my question. To summarise:
There are at least 8 manufacturers (or at least labels) for 'Unistrut' type
products.
All my local electrical suppliers can supply Spring Channel Nuts, as can Home
Depot and Lowes. None of them carry the 13/16" size.
(13/16" in this case refers to the width of the channel - the more common size
is 1-5/8". Channels are also available in several depths including 13/16". This
can lead to confusion.)
There are hundreds of offers on Ebay, but none that I can find for the smaller
size. But perhaps I have missed the crucial one.
I only need a few which limits genuine wholesalers.
McMaster-Carr do seem to carry the ones I need in small quantities. I will see
whether they will deliver to Canada - their online order form does not seem to
have the option of a Canadian address.
73 Roger
VE3ZI
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