Dev Null wrote:
I have some "heads" for a combination square but no rules.

These are small heads, a standard rule will not fit, too wide and too
thick.

The Starrett website lists some 4" rules that are 1/16" thick but are
english graduations only, standard rules are 3/32" thick.

Does anyone know where I can buy rules only, with metric or
metric/english graduations?

Thanks

If it's a Starrett square, they will have the blades for it.

John Martin