Thanks for your help.
I searched the YKK online catalogue and I think they dont make this item. I am still awaiting reply from zippersource.
The one shelby's have are 6mm which I think is #5 type.
Since YKK doesnt make this item my only option is #5 separating zippers. 2-way separating zipper are tempting but I am not sure if they are worth the extra cost.