The lure weight should always be the weight of the assembled spinner.
Sometimes they are described by the size of the blade they're sporting.
Some use a strange "number" system like Panther Martin, but they are kind enough to disclose the actual lure weight as well.
Some blade makers #5 blade is the same/similar size as another's #6.
If you are building a new pattern, it's a good idea to go to a local shop and buy a few of the correct parts to make up a
pattern. Save the pattern for future reference....don't fish it
When ordering parts online for your pattern, verify the
lengths of the components you want, with your vendor before buying.
Edit:
Smart manufacturers know that some of us are trying to match rods to these spinners, so posting actual, total, lure weight is very important.