You can narrow the front beam 2 inches and use a 17X7 wheel with ET in the 50-55 range and the wheel/tire should clear both the suspension and the fenders. I would limit tire size to 205/50-17.
The rear will be another matter. Most 18 inch wheels will be at least 8 inches wide and many are in the 8.5 to 10 inch range so trying to fit wheels that big (wide) under the stock fenders will prove to be a challenge.
I have a 70 type 1 and I have 17X8.5 ET 50 Porsche Turbo Twist wheels with 245/45-17 tires mounted to stock beetle trailing arms using 944 Turbo Brembo calipers, rotors and 944 NA hubs. This combination required using CCC 1-1/4 inch wider rear fenders to get the tires to tuck. I had to grind about 1/4 inch off of the rear bump stop and install a flat head bolt in the spring plate so that I wouldn't have to run spacers to get the tire away from the suspension. There is about 1/4 inch clearance between the tire and fender with this set-up.
The front beam was narrowed 2 inches and I have 17X7 ET55 Turbo Twists with 205/50-17 tires. The front brakes are 1987 944 Turbo Brembo hubs, calipers and rotors. This combination fits with plenty of clearance at the suspension and about 1/2 inch clearance between the tire and fender.
Great looking car you have there.
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