86.5 and not an 86 Supra?

[Porsche_911]

How would I know that my Supra is an 86.5 Supra and not an 86? This maybe a stupid question but I really can't determine it. Also, does 86.5 have a lot of improvements compared to 86?

I heard that 86.5 are considered 87 models and use 87 Supra parts, is that right?

I guess to many questions in one thread. Thanks in advance.