dont know if you will find it at any of these, but worth a try
http://www.ruger-firearms.com/Firearms/PS-PartsOrdering.html
http://www.ebay.com
http://www.e-gunparts.com/
http://www.gunsamerica.com/
http://www.gunbroker.com/
http://www.auctionarms.com/
http://www.ruger-firearms.com/Firearms/PS-PartsOrdering.html
http://www.ebay.com
http://www.e-gunparts.com/
http://www.gunsamerica.com/
http://www.gunbroker.com/
http://www.auctionarms.com/