Ok, so I did a little research on the fitment of these things.
Stock S13 SE wheels are 15x6 + 40mm
The 501's are 16x8 + 15mm
So I went and checked out this offset calculator:
http://www.1010tires.com/WheelOffsetCalculator.asp
It says that the inner clearance of the 501's is IDENTICAL to S13 SE wheels. That makes me pretty comfortable.
It says the outside edge is another 50mm farther out, but I think that sounds like it'll be about flush.
Does this sound about right?
For the record, the 002's in 15x8 +0 have 15mm MORE inner clearance than stock with 65mm in outer edge extension.
The fact that the wheels are 16" instead of 15" shouldn't matter, as you just decrease the sidewall thickness and the rotational diameter remains the same.
What size tire is everyone running on their 002s? Should I go with 225's or 205s?