Bed Extension Kit for Alterra Beds, 42" Wide, 1 EA (FCE42KIT) EachExtenders include all of the necessary hardware to mount to the bed and mattress retainers to prevent the mattress from sliding off the bed during use Extender FCE1232EXT extends the bed length from 80" to 84" to accommodate taller residents and can be mounted on either the head or foot sections Extender FCE39KIT extends 34. 5" wide beds to 39" and includes 4 extra long side rail mounting rods for use with the soft touch rails and assist bar Extender