The zerk-style spring perches were, I believe, used on early Fairlanes and also show up on highly modified roller perches. Here is such a modified perch.
![](https://dazecars.com/dazed/perchpix/brass.jpg)
These perches are NOT correct.
There a number of concours pics on this site of just the perch. You REALLY need to get familiar with the search feature.