Wheel offset and backspacing for a base gt, nite pony wheels

[Glossox]

Iv got a base gt, nite pony wheels 19x8.5, 255/40R19. I bought the 6piston brembos without the pp. I’m guessing that the wheel is the same with the brembos and without the brembos (the wheel on fords mustang builder didn’t change)

I want a spare full sized tire, but I’m not sure of the offset and backspacing needed to make it identical to the stock wheels.

Does anyone know the offset and backspacing for the nite pony wheels on a base gt?

(i looked into the spare from automotive authority but it’ll be almost the same price to just buy a wheel and tire)

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