Hello,
I post this here so others can find the filter part replacement without too much guess work.
I have searched for the original NEC160C part and it is " out of stock".
Then on other online parts sellers and eBay the price is just a joke, too much.
Finally, I found an European model Grundig Filter 23620 For Grundig VCH9629 VCH9630 VCH9631 VCH9632 .
It is identical with the Eureka one. Job done once the information is figured out.
These I got from Ali are around 5$ plus shipping, very affordable and fit perfectly. Search for the Grundig model.
Cheers