As we know One bed will have 4 pc casters.How to match central locking casters? Before talk about this we should know the difference of central lock.At current we have 3 type of locks.

* 2 step 30/45 degree Lock Cam--With x1 Neutral + x1 Total Locking =A
* 3 step 30/45 degree Lock Cam--With x2 Neutral + x1 Total Locking =B
* 3 step 30/45 degree Lock Cam--With x1 Neutral + x1 Direction lock + x1 Total Locking=C

The alignment of ONE bed of central locking castors need follow below 3 options.
1: 4 pc x A
2: 2 pc x B + 2 pc x C
3: 3 pc x B + 1 pc x C

4 pc x C cannot work on ONE bed

The 2 standard size of Central lock stem is Ø32mm x 50mm and Ø28mm x 98.5mm.So now whatever you want purchase central brake casters for replacement or build new bed.Please follow above mentioned instruction.