Valve cover breathers, smaller than 1 inch??

I have a set of old Cal Custom valve covers, they are sweet.

Unluckily, they have a smaller than modern standard hole, 1" diameter.

Are there any valve cover grommets that fit 1" and valve cover breathers with PCV hose hookups that will fit this?

I can find plenty of 1-1/4" and 1" neck breathers, but I'll need something smaller. Ideally with a smaller than 5/8" hose connector. If you can point me to something like this in polished aluminum, stainless, or chrome I will send you a free gift...

Valve cover breathers, smaller than 1 inch??
Author: ideologist