The 1928-31 Roadster was the only body style using a 7 leaf rear spring, Ford # A-5560-C. Because it was installed with the same spring clip bars as the 8 leaf spring it had a short dummy leaf Ford # A5585. In summary it is a 7 leaf spring with an 8" long dummy leaf with square cut ends. It is the only rear Model A spring using a dummy leaf. If you are not doing a show car you can of course improvise.