I bought replacements at:
EZ Loader Edmonton, Alberta, Canada 780-482-0464
Servicing dealers in Alberta, Northern British Columbia, Yukon
- See more at:
http://www.ezloader.com/#sthash.JgVRBzfP.dpuf
Was around 18 months ago though so I am not sure if they are still in business but worth a shot, you may pay a slight premium but should get the right part at least.
Edit: link goes to wrong bit of the site, click contact us then locations and scroll down for Alberta