For the rear you can use 2 hockey pucks, 1/2 of a rubber mallet, or daystar makes some rear bumpstops. Need to drill into the spring perch and bolt down the bumpstop.
For the front, you can use teraflex bumpstops. Not sure if there is any dealers in Canada, but I know JBA and trailquest sells them. P/N 1903200.
Might wanna try asking local 4x4 shops.
http://www.trailquest.com/teraflex/KJ/suspension.shtml
http://jeepinbyal.com/prod-TeraFlex_Bump_Stop-653.aspx
EDIT:
For the front:
http://www.teraflex.biz/dealers/international/
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2002 Jeep KJ Sport 3.7L 4x4245/75-16 Mastercraft Courser HSX, 16x7 Cragar, 2" OME MD Lift, ARB Bumper
AEM Brute Force Cold Air Intake, Flowmaster Super 44 Muffler
Currently working on: Full service on transmission & bed-lining ARB bumper
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