The Turbo parts will fit a NA only if you change out the Spindles also. The Hubs are the same on '83 to 91 944's and Turbos. Different mounting on the Struts for Turbo's and Na's - Springs will work NA's and Turbo's, early and late. Different parts - spindles and Struts on late '87 and up.
If you do go with the upgrade Turbo spindles to fit the Turbo Struts on your '86 NA now the NA Calipers and Rotors will not fit. So you now have to upgrade the Calipers to the Turbo/Brembo Calipers and the larger Turbo Rotors (Nice upgrade).
To send off to an authorized shop and have the Struts rebuild/re-valved is almost as expensive as new ones. Go with the INSERT Replacement on the struts and rebuild them your self that way and save allot. The new insert replacement should be Part No. 8641-1038 Sport and they are externally adjustable...
See also this thread for the insert replacement --->
http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/337896-weekend-project-pics-koni-inserts.html
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78-924 traded for 80-931 traded for 84-944 traded for 85.5-944 (7th one now).
UAV-M1 (Urban Assault Vehicle - Model 1)
Bless the lowered, and pass the nitromethane.
Pedal to the metal till you see the gates of hell then brake
NLA - No longer available is a four letter word