[175K911]

The ‘86 had three wheel sizes offered:
Stock were phone dials 15x6 with 195/65-15 and 15x7 with 216/60-15
Fuchs option of 15x7 and 15x8 with the same tire sizes
2nd Fuchs option of 16x6 with 205/55-16 and 16x7 with 225/50-16

On my first ‘86 that I had ordered new I ordered with stock phone dials not wanting to pay an up charge for Fuchs since I had a set of Fuchs 16x7, 16x8 that I was going to take off my ‘83 SC that I was trading in. But the car got built with the damn 16” Fuchs, seems the factory assumed since I’d spec’d the car with spoilers, limited slip and sport seats that I must have forgotten the “performance” 16” wheels. So the dealer took the phone dials off another new 911 in the showroom to put on mine and took the up charge off the price

My current ‘86 was delivered New with the 15x7,8 Fuchs per the options tag, were still on the car when I bought it in 2008.

The reason I share all this is because perhaps the OP can tell the tire shop that in fact 7&8” wheels were a factory option, just don’t tell them it was 15” instead of 16. Rolling diameter of the 15’s and 16’s is virtually identical.

However, on all the SC’s and Carreras I’ve owned over the past 35 years I’ve had to roll the front wheelwell lips to move the 7’s from the back to the front.