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Yes, it should be a perfect fit.
Not without modification
Yes they can. I have an 87 Cadillac Brougham with 22 inch Azura's on them and they fit good. No modification but on a full u turn there is very slight rubbing with the front tires.
yes. i have a 1990 caddy my rims fit wit no problem.
No the engines are not the same.
yes i put 265/35/22 with 1 1/4" spacers perfect fit.
no the you would have to alter the suspension about 2 to 4 inches to fit correctly to prevent rubbing
Yes they can acually with the right lift kit you can put 24s on it .
Yeah i got 24's on my fleetwood now.......just get sum spacers for the front n back .
Yes. The engines are both V8 northstar engines, the one in the SLS is just a different version with less horsepower and more torque.
While your standard 5.0 liter (307 cubic inch) engine will fit into your '86, you can put a larger or smaller engine in there. I have seen an '86 with an 8.2 liter (502 cubic inch) engine in it, taken from a 70-75 Eldorado and I have done the same with my '87 Fleetwood Brougham.
A similar year Oldsmobile Toronado's rims will fit a Cadillac Eldorado's