Just thinking out loud here, but maybe the bracket on the passenger side got installed upside down??? It looks like the 4 mounting hole spacing is pretty close to the same top and bottom, but maybe not exactly the same. Looking at your pics, the passenger side top of the caliper looks to be pushed out from the rotor, where the driver side looks to have matching gaps at top and bottom of caliper to rotor. Can't see the back side mount relationship for the passenger side without another pic to try and further compare with the drivers side. wink

The very small gap on the 16" wheel may be okay, but any deflection of the wheel could cause some serious binding and metal shreiking - Ouch! Me personally, I'd go for a little more clearance.

BTW - Congrats on finding a cheapo wheel for testing. smile


~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)