Mine fit fine - never had any problems.
You might want to run some wet'n'dry round the outside edge of the link and the inside edge of the cans where they meet, just to make sure you've taken all the crud out. It's then a case of wiggle, wiggle, wiggle until they line up correctly.
Don't attach any of the springs or bolts until you're happy with the fit.
I know it's easier said than done but when you've finally cracked it, its much easier second/third/fourth time round!