Will these fit a 65' Malibu SS???

[ssx]

I just purchased a set of Billet Specialties Fatlip 18X7 and 20X8.5 wheels for my 61' Impala before it sold. I am considering a 65' Malibu SS and not sure if the wheels will fit??? Here are the specs:
18x7 with 4.25" BS
20x8.5 with 4.75"BS
I am thinking the fronts will not be a problem, but not sure are the rears?
I have not purchased tires yet. Thanks for any help....

[Travis B]

I think they will....but the rears will be CLOSE

[USAZR1]

I think they will....but the rears will be CLOSE
I agree with Travis. They will fit the car but you might have to drop down one tire size than you could normally run.
My guess is a 255 will fit but it might be snug.

[ssx]

Thanks guys, guess I'll have to keep my fingers crossed!