e-gunparts.com seems to have many parts for the gun:
http://www.e-gunparts.com/products.asp?chrMasterModel=089Zz325C&MC=
Parts of Savage Springfield Model 18 are available at Gun Parts Corporation. These can also be bought from Field and Stream.
website for gunpartscorp, letter S, Savage, Model 73, and there is a parts diagram.
http://www.gunreports.com/special_reports/long_guns/Savage-Slide-Action-Rifles-gunsmithing-model-1702516-1.html
Your gun is a Savage/Stevens Model 86. gunpartscorp.com has some parts. After that it is a long search.
Basically a Savage Model 63 single-shot bolt action .22. I have some parts for that model. sales@countrygunsmith.net
Numrich Gun Parts. and Posibly Midway USA
Looks like Savage built them. Their model SB100B. Hawthorne model name was "Vulcan". Parts are available from Numrich Gun Parts. Good to see someone else owns one.
Try Gun Parts Corp. They have a web site
need a new ejection arm
check with: dixiearms.com
Numrich.com
I would first look to numrich arms in as they specialize in old gun parts.