Trim the dust cover so it clears the mount. It's not like half an inch of sheet metal more or less is going to affect the performance of anything, and the "dust cover" doesn't really seal dust- - - -it mostly keeps pieces of gravel from bouncing up and getting grabbed by the flywheel ring gear.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!