@Jay11 you don't say 2 or 4wd:
wheel-size.com/size/ford/edge/2008/#region-usdm
Center Bore / Hub Bore: 70.5 mm, Bolt Pattern (PCD): 5x114.3 (5x4.5), 7.5Jx18 ET44, 245/60R18 (stock) - they're going to be about same size as a 31x9.5R15s.
Wheel size, PCD, offset, and other specifications such as bolt pattern, thread size (THD), center bore (CB), trim levels for 1998 Ford Ranger. Wheel and tire fitment data. Original equipment and alternative options.
www.wheel-size.com
Center Bore / Hub Bore: 70.5 mm, Bolt Pattern (PCD): 5x114.3 (5x4.5), 7Jx15 ET12, 235*65R15 (stock on my '98 3.0)
So, if you remove the center cap, they probably bolt right on the front. (They would bolt right on the rear) But they will be a lot more inboard (ET44 - ET12 = 32mm in). So, running 30-35mm spacers puts them right back to stock, 38mm move them out about 1/4"....she'll probably not even notice that.
Buy/special order quality spacer with 70.5mm center bore. Don't

around with a dremel to make them fit - I might be on the same road as you, and I don't want to be killed by your tire coming off.
Clean the rotor/studs, mount the spacer with Locktite blue, then mount the Edge wheel.
I don't recommend Locktite red as you might have to replace the rotor/bearings and its real PIA if the stud spins before the Locktite lets go.
And heating the stud to breakdown red Locktite without damaging the spacer can be dicey.
We got a fancy HAAS Mill/Turn machine recently: For the 1st test parts thru it, I turned a set of spacers.