The factory specs are for bias ply tires. They’re actually worse than useless, because they’re absolutely wrong for radial tires. They're almost opposite of what you actually want. The person doing the alignment definitely needs to know that, but they probably won’t because they probably won't be old enough to know that these cars came with bias ply tires from the factory and not radials. And depending on the shop, they won’t align the car to anything other than factory specs regardless. A lot of the major chain alignment shops will only use the specs in the computer, which are the factory specs.
If you're running radial tires on one of these cars, you should be using alignment specs similar to the ones in this chart
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