ᐅ Ikea Faktum Pull-Out Drawer / 40 cm

Hello,

I urgently need help assembling a kitchen cabinet... I bought a base cabinet with three drawers, which has a continuous front panel attached to the bottom drawer.

The front panel has rounded recesses on the left side covered with plastic caps. On the right side, the recesses are filled with matching(!) round plastic discs.

Now, you are supposed to drill the drawer runners yourself at those points. A drilling template is included. However, the instructions show that you should drill into the plastic discs and through the plastic caps. The supplied screws, however, are not long enough to reach into the cavity behind the plastic caps...

Did I possibly misunderstand the instructions?! *g*

Does anyone know this problem?!
I’m about to lose it. All the other cabinets are assembled and were really easy to put together...

Thanks