The knobs on my 1964 ‘D’ model didn’t look like what you showed. They were more of what I’ll call a ‘trumpet’ or ‘tulip’ style. The knobs were white, except for the master which I believe was red. The same knob was used on the seat adjuster. Here’s a modern-day equivalent:

[Linked Image from media.digikey.com]


In any event, DigiKey has plenty to choose from. Here’s all their 8-32 stud size knobs here:
https://www.digikey.com/products/en...;ColumnSort=0&page=1&pageSize=25

The one that most closely resembles what I had is this:
https://www.digikey.com/product-detail/en/davies-molding-llc/3704-S/1722-1154-ND/6566377

-Kirk Wennerstrom
President, Cessna 150-152 Fly-In Foundation
1976 Cessna Cardinal RG N7556V
Hangar D1, Bridgeport, CT KBDR