Same place: Order 4 rims or tires, and get an extra $100 off... Deal ends today.
That works out $54 each for the rims... Instead of listing backspacing, it lists offset -- The 16" rims are -6mm, and the 15's are -19mm.
I think I've got it sorted out -- For the 15", if the centre of the 8" rim is at 4" (Duh), and -19mm is about 3/4", then I think it should be about 3.25" backspacing, right?
Not sure why it won't list the 15" ones as fitting on a Sidekick, but if someone can confirm the backspacing, I think I might go ahead and order them.... If they'll ship to Canukistan.
-Al.