ᐅ Connection part for overflow/IKEA/sink to trap—where to find?

I am a single mother and received an unused IKEA sink (1 basin / 1 drainboard with an overflow located directly between them) as a gift for my new kitchen. Unfortunately, the connection between the overflow and the trap is missing, so the sink and the dishwasher cannot be connected.

The sink is made of "hard plastic" (surface similar to granite) and was probably purchased from IKEA. At the hardware store, there is no suitable connector, and so far I haven’t received any response from IKEA.

The outlet of the overflow is quite unusual and rather rare – it should be a slip-on part because the overflow outlet is not flush at the bottom but ends as an “oval-rectangular pipe” about 3–4cm (1–1.5 inches) long (awkward description, but as a layperson I’m missing the technical terms). You also cannot screw the drain onto the overflow (as is common with other sink manufacturers).

Could someone help me with the following information:
- What this part is called (possibly with an IKEA item number)
- Where I can get it

Unfortunately, as a newcomer I cannot upload a photo here – otherwise everything would probably explain itself. ;o)

Thank you very much for your help!

I have just added two photos of the sink overflow in my gallery (top view and bottom view).

I appreciate any tips. ;o)

Best regards,
Conny-okd

Hello,

are you absolutely sure that the sink is from Ikea? How old is it approximately?

Regards

Na.

According to the house seller, the sink is indeed from IKEA. However, no one could tell me how old it is.
It looks completely new and modern, so I don’t think it can be very old...
In two different hardware stores, I was independently told that the type of overflow is typical for IKEA.

Thank you very much for the link. Unfortunately, it didn’t have the right solution either; here, the connector piece always has to be screwed onto the overflow, or the overflow is located on the side of the basin...

So I will keep looking for a solution.

Could you please take a photo of the entire sink?

Somewhere underneath, there is a sticker with an 8-digit number. That is the IKEA number.
Is it still there?