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NO, they have two completely different motors.
yes
Yes. The H22a and H23a motors can interchange transmissions.
No, the third and fourth generation are a different Chassis.
It's hard to say, as the question didn't specify what kind of solenoid are you attempting to fit, and the 1990 Prelude had a mid-cycle refresh which included an improved motor.
No. The Prelude has a B20A5 motor. The civic will have a D-series tranny. They will not interchange (B and D series parts do not interchange).
they would fit but your car would run rich because the 90 prelude is a 2.0 the other one is a 2.2 or a 2.3
No, the Honda Civic springs is not compatible with any generation of the Honda Prelude.
No, the 88 and 93 are a different chassis.
If you're talking about the headlight itself, and not the bulb, no it will not swap between a Fit and Prelude.
Yes it will fit, all of the twin cam third gen preludes 1988-1991 have the same motor config. You can even put the fourth gen vtec prelude motors in the third gen chassis with mount kits.
No not all