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A good question actually.
Disclaimer: I THINK this is generally true, but I'd confirm any part before purchasing. Some parts won't really fit this generalization.
There are three major (US market) MK1 varieties: 85-86, 88-89, and 88-89 Supercharged.
Many of the stronger suspension parts (and I think the transmission) from the 88-89 SC models were included in with the 88-89 NA.
The 87 is a bit of a bastard. It shares engines with the 88-89 NA, but most other components are shared with the 85-86. The 4AGE engine had blue and black lettering on valve covers 85-86, and red and black lettering (and a few additional horsepower) 87-89.
Though many parts may not be the identical from various model years, the may still be interchangeable.
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