I'm guessing you have googled "331k105" This is what I got
331k105
I hope you got the correct needles for your machine. According to
ISMACS model list, which doesn't list 331k105, but the other 331K machines takes a variety of needles. It also lists it as an industrial machine.
Another place that has some 331K parts lists but I didn't see one for 331k105 is
https://web.archive.org/web/20190727.../IPpartCharts/
Janey - Neat people never make the exciting discoveries I do.
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