Rims/tyre questions also

Few things I'm wondering about.
What 911 years did they make the cookies for?

I was positive I knew what the numbers on the tyres stood for. correct me if I'm wrong..
255(width)50(profile)16(rim dia)

Also, what size rubber and spacer is needed to make a 8x16 fuch work under the front end of a turbo flared fender?

Thanks fellas..............S