You should have the drawer divider? partition? that is used in the 30" and 36" 4 drawer stacks. I haven't one myself, so I can't be of much use, other than to say that the instructions for that item is on the IKEA Instructions page on the Fansite side of things - click on Home in the upper right corner of your screen, then navigate to IKEA Instructions and look for it in the Interior Fittings group, I think. Good luck!
Susan
P.S. If I haven't already said so, Welcome to the Forums!
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