ORIGINAL: 944 man
Yes. You need to be sure of your car's model year too. Year of registration or manufacture aren't relevant: its the Porsche model year that counts. The pertinent years are 1986 and 1987.
Look at the 10th character in your VIN. G=MY86 and H=MY87. There aren't any '85 Turbos and nor are there any '85.5' Turbos - it's a stupid American term which came about because they can't understand the concept of model years. All Turbos are series two cars, so 1986 model year onwards - some were built in 1985, and some 1987 model year Turbos were built in 1986.
If you have fitted 1987> 16" Telephone Dial wheels to your 1986 car then they will look ridiculous, so I doubt that this is the case. If you look at the valve you'll see the rim width and the wheel's offset (8 52.3 for e.g.). You need to see 7 23 and 8 23 and these wheels will have part numbers 951.362.114.00 & 951.362.116.00 (ending .01 will be the later offset replacements, which don't suit your car).
951 type Fuchs wheels will have the same offset for both front and rear (ET23), unlike 911 Fuchs wheels which usually have ET11 rears. The rear isn't particularly sensitive to track so you can space them out to fill the arches more if that's what you like, but a wider track will promote understeer. I wouldn't fit spacers to the front for cosmetic reasons.
