I'm looking for the small white plastic knobs (cabin air, etc.) for the
panel on a C-172 C model (1962). I've looked on Plane Plastics, Spruce,
etc. with no luck. I know this has to be a common problem because they're
all cracked and dingy looking, and I've noticed it on other planes as well.
By the way, I passed my PPL checkride last weekend--- what a relief!

Thanks for any help,
Greg M