Cjim, that is what the PO of my SC did. I believe he used the same spacers as used on the 930's. If you take a look at the images of my car on my website, you will see the 7 inchers fill out the fenders quite nicely. No rubbing problems, either.
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Doug
'81 SC Coupe (aka: "Blue Bomber")
Canada West Region PCA
members.home.net/zielke/911SC.htm