your other wheels should have offset stamped in the back side of the hub in between the lug holes. if for some reason they aren't, lay a flat edge across the back of the wheel and measure to the mounting surface of the wheel. that will tell you your backspacing.
I see 16.5 wheels for sale rather often on craigslist.
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"understeer is when you hit the wall with the front of your car, oversteer is when you hit the wall with the rear of your car, horsepower is how hard your car hits the wall, and torque is how far your car moves the wall."
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