Well, yes and no.
First of all, and not to split hairs, but they are all "one piece," but some are one bolt and some are two bolt.
My 76 has a one bolt stay, but it is not the one in Shipper's first two pictures. I'll repeat what I wrote before, Shipper's one bolt stays are for 1977 and later models (models with 35mm forks).
The one bolt stay on my 1976 attaches to the steering yoke to the RIGHT of the headlight, and it is about half as long as the 1977 and later stays which attach to the LEFT of the headlight. You can see what I mean about the left of the steering yoke in Shipper's pics.
The Tech bulletin is interesting, but I haven't read it yet, nor do I have time to attach a pic of my 1976 stay, but I think what you are looking for is either a two bolt stay or the correct (short) right-side one bolt stay.
I do have a spare one bolt stay of the type you need. If you can't find one in Canada then PM me your postal code and I'll send you a quote and a pic.