Will 18s fit, yes. No idea if these specific ones will.
Here are the specific changes they made in 1998 to safely use 18" wheels on the 986.
"18” wheel option with rear chassis reinforced to accept new wheels. Rear body structural change included redesigned wheel wells and coil spring mounts, lower engine compartment bulkhead, rear wall crossmember and rear axle mount reinforcements."
For tooling around town and local drives, they will probably work. Don't go onto the track or try any autocross or similar stressing maneuvers.
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