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The original “S” wheels are Fuchs 6Jx15 with 185/70VR15 tires. The ‘deep dish’ version from ’69-’71 do not have the ‘safety bead’ These are also now difficult to find and expensive.
The similar 6Jx15 Fuchs from ’71 through ’77 has the safety bead and is commonly available. Even perfect examples can be found at reasonable prices. Originally these came with 185/70VR15 but today it is common to use 195/60-15 tires.
You can fit a 7Jx15 and 205/55-15 to the rear if you are very careful.
The easiest and least expensive choice are the 6Jx16 Fuchs common on the front of 911SC and later. There are many ‘like new’ available. It is common for them to have been stored in garages with the rear 7Jx16 moved to the front and new 8Jx16 installed on the rear.
This wheel, with a 205/55-16 will fit on all four and will fit as spare. If your 911 sits low, you may need to pay attention to the front fender lip about 8” up in the front. Many cars (even with OE set-up) can have a new tire snag the lip.
There is far greater selection of appropriate tires with 16” diameter than there are for 15” wheels.
It is possible to fit a 7Jx16 and 225/50-16 in the rear. To do this, you need stiff springs to limit wheel travel and compromise alignment (2°+ negative camber) and consequent inside tire wear. There were sufficient differences in body position that this may not be a choice.
I hope you have stored away your “Comfort Package” for posterity. If not, I encourage you to do so. It will make a nice ‘wall hanging’ object d’art for your garage.
The details are important. With some preparation, this is an easy Saturday DIY project. Some is normal every 40-year maintenance, regardless of mileage.
Starting in 1970, when Porsche installed the Comfort Package they used 911E-only suspension components. These were the regular 911T/911S parts but partially completed. In particular, they were the front suspension cross member that supports the two A-arms and the steering rack and the two A-arms. The ends of the cross member lacked the provision for supporting the torsion bar lever. The A-arms lacked the splines for a torsion bar and the lower part of the structure out to the ball joint. The first thing to do is determine if you have these original parts or they are changed to the T/S parts.
Not installed were the torsion bars, adjusting screw, foam seal and lever arm. Of course all these came with the ‘self-leveling’ hydropneumatic struts. The common joke was they self-leveled collapsed on the rubber bump stops.
The good news is all these came with the aluminum caliper 911S brakes. These use the 3.5” support spacing struts.
