Has anyone seen or seen for sale a pair of right angle side cutters.
The only pair that I can remember seeing were being used in a garage in the early 1970s.
Maxon makes a set of flush cut side cutters meant for model railroading hobbywork, as does Xuron. The Maxon ones are heavy duty, but I'd not cut steel wire/piano wire with them since you'll nick the jaws. Fine for softer stuff.
End nippers or offset end nippers? Lots of options.
Below are some ideas I think you may be referring too. Showing you amazon for ease of use but you can shop anywhere for better pricing or better images. You can also download their catalog and browse through.