Over here we don't consider them hybrids....it is all we have ever seen. The 3/4 nuts on the 7/16 screws holding the front eyes are unusual to us, since normally that size would use either a 5/8 size nut, or more commonly a 7/16 nut. !/2 inch is indeed the size we use for 5/16 threaded fasteners.
Very few (to none) of the bolt heads on the Cdn carriers have any head markings that I can recall either.
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