Thanks for the input Claudia. I think there are two "Arc"s. What I was looking for is an activity regulated protein,Arc, also known as Arg3.1. The one you suggest is different.
I recommend a free antibody database available at labome.com. With regard to antibodies to Arc (Arg3.1), you can follow this link: https://www.labome.com/review/gene/human/ARC-antibody.html. Santa Cruz Biotechnology has several anti-Arc antibodies for Western blotting: rabbit polyclonal ab sc-15325 used in western blot on mouse samples at 1:500 (ref: Herring et al., Alzheimers Dement 2016) and mouse monoclonal ab sc-17839 used in western blot on mouse samples at 1:1000 (ref: Nakayama et al., Sci Rep. 2016).