the ultra dynos are in a Hotshot advert in the xmas 83 action bike - they look very similar - can scan the pic if it helps
Yeah stick it up mate
The more I look the more I'm thinking they are tiogas - if you look closely on the goose theres no offset on the chainring so it's more than likely a 130bcd shimano/takagi/tioga fitment spider so the tioga fits the bill
put that with the slotted chrome end cap and it looks the part I guess