Yes that is the Part # and yes you can order them from [link=http://www.cenracingdirect.com/index.asp?PageAction=VIEWPROD&ProdID=292]CENracingdirect.com[/link]

And for $16 + shipping you will have a spare!!

When you get to opening the Diff Be sure to us heat to "Melt" The Locktight to get the screws out. be sure you use a good Hex Drive and not the Bent Allen Wrenches tha come in the kit. Use a Good Quality Hex Driver!! Be sure the hex driver is fully inserted before attempting to "Break" the screw loose..

Hope This Helps