I Need A Simplicity Ellis Conversion Kit To A Full Bed How Am I Supposed To Be Able To Convert My Child's Simplicity Ellis 4-in-1 Crib Into A Full/twin Size Bed?

How am I supposed to be able to convert my child's Simplicity Ellis 4-in-1 crib into a full/twin size bed? - i need a simplicity ellis conversion kit to a full bed

I searched everywhere for the "full bed conversion rail kit, but can not find it. It seems very stupid this company to advertise their products as a 4-in-1, but it seems to have nothing to offer to me here ! help?
This is my house, I think http://babies-kids.pricegrabber.com/baby ...