narrowed beam and fitiment issues

[jmillheiser]

i have a 73 std beetle.

i want to run 17" rims on it

was wondering what sizes/offsets will fit on it with a stock width beam and with a narrowed beam.

also at what point do i need to narrow the rear.

i plan on using a 4x100 lug pattern due to the availability of rims in this pattern.

also curious on what tire sizes work well on our cars