Winter Wheels for 200 tq

[flderoos@mmm.com]

Any suggestions on steel wheels for a 1990 200 tq?  I hate to wreck my
alloy wheels by mounting and dismounting tires each winter, so I'm
considering steel wheels.  I have found two commercial sources, one with
15x 7 wheels and the other with 15 x 6 wheels.  The two are within
$1/wheel of each other.  Neither knows the offset, but both claim that
they fit the 200 tq.  They are also suppose to fit the A6, A8 and the
V8.  The vendor with the 15 x 6 wheels says that they are Audi wheels,
although I doubt if Audi makes its own wheels.  Any suggestions on which
size to get?  I am mounting 205-60 x 15 snow tires on them. 

TIA

Fred