Another rear tire size question and advice needed.

flathead31coupe said
So today I had a little time so I switched out the l sixties which are equivalent to 275 60 15 with 255 60 15... When back on the ground there is a little more than a quarter inch on the driver side and a quarter inch on the passenger side from the tire hitting the spring..... I'm thinking it will rub..so in talks with someone about a spacer....
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Do you still need me to pull a wheel and measure my spacer? Im sure that we pretty much have the same set up (8.25, 15x8(4.5" bs), 255/60-15).
You can probably figure out what thickness you need now that you have a 255 on the wheel.