Yep, the cup is very different to the Zip Starter one, as MF mentions above.
Victa P/No ST12185A is the OEM part - NLA, unfortunately. They do come up on FleaBay, sometimes under aftermarket [Bynorm/GA Spares] part numbers.
There are also 4 spacer washers [#20] and the 4 short mounting bolts [#17] shown in the parts list in this post;
https://www.outdoorking-forum.com.au/forum/u...re-victa-vc-160-questions.html#Post55175