From my 96 service manual:
The rear wheel bearings are of a cartridge design and are pregreased, sealed and require no scheduled maintenance. The wheel bearings are preset and cannot be adjusted. If a bearing is disassembled for any reason, the wheel hub must be replaced as a unit. No individual service seals, rollers or races are available. The hub nut torque of 290 N-m(181 lb-ft) restricts bearing/hub relative movement and maintains axial position of the wheel hub.
Just remove the nut and slide the hub/bearing off the rear spindle. You don't need an "arbor" press. See # 3 below.
http://www.trademotion.com/partlocator/index.cfm?action=getLocator&siteid=213787&chapter=DP2FM0&appSectionid=24&groupid=20135&subgroupid=60763&componentid=0&make=10&model=Contour&year=1996&graphicID=FMP100&callout=3&catalogid=1 
