- X38: 7/8" front bar diameter
- X49: 7/8" rear bar diameter
- FR: Adjustable anti sway bar at the rear axle.
- R: Anti sway bar only fits vehicles with original equpment front anti sway bar.
- H: Order anti sway bar adapter kit# 55320 when installing anti sway bar #52155 or #51140 on 1988 model civics
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