Precor EFX 5.21si c532 Elliptical Ramp Great Condition Low Hours 38255-101Item Condition: Used Works with. Precor C532 (64, CF) EFX 5. 21si 120V 5. 21si Rev. J 05 29 01 (5F) No Longer Available from the Manufacture In Like new condition Trusted Seller, 30 day guarantee! Mint condition, like new Used on the following models and serial #s: Precor C532 (64, CF) EFX 5. 21si 120V 5. 21si Rev. J 05 29 01 (5F)