The correct choke cover/spring is part number 170-U61S.
This cover fits mostly Carter replacement YF's for Chevrolet.
Other covers will fit, but have incorrect spring tension. Many of these can be adjusted to "worK", although not as well as the original. There is also a generic unit available that has a generic spring, same issue.
Since you have the spring, a generic cover with your spring should be the least expensive expenditure.
Check the auction terms, and with the vendor. It is possible that the shipment was insured.
Jon
