16's might not fit as they'll scrub on you brake calipers. There are reasons they fit that size wheel not just for looks.
All the newer D40'S with the 17 inche rims are fitted with larger diameter disc's then the older models with the 16's. The older STX's with 17 might fit 16's as they where larger but not as big as they are now.
The offical fitment size for most 285/33's is 7.75", but no one make that size rim thats why the say to use 8" rims.from the mouth of the NSW Mickey Thompson Managing rep "7.5 inches is close enough"