someotherguy
+1y
I think the wheel opening is different enough between a single wheel fleetside and a dually that there's no way the factory flare would work, unless you did some heavy modifying. Not trying to discourage you but it seems like if you gotta modify the flare and fender maybe it would have been better to just stretch the fender instead, probably not easier but the end result would look better and be stronger.
You might find a 4x4 in a boneyard that has some you can score cheap and try, or LMC sells them new (chinese garbage) for like $100/ea.
Richard