Time to replace the wheels and tires on my 69K mile '87 GN (I'm the original owner). I like the American Racing Torque-Thrust IIs (AR-505) and would like to use 16" X 8" with 3 3/4" backspacing. I've seen lots of pix of TT IIs on GNs, but they're only offered in 4" backspacing (or worse) in...