1974 SB Fresh Air Control Knobs

[LeeFred]

I have the fresh air control mechanism in our 74 SB, but no knobs. I bought a pair of knobs online, but they don't fit the square ends of the control mechanism that sticks through the dash. These are the knobs I purchased, but they seem too "shallow" to fit and they don't fit on the square portion:

https://www.jbugs.com/product/113819661F.html

And this is a not so good pic of the area I am talking about:

[vamram]

Hunt for them in the Samba classifieds, there are complete mechanisms and parts for sale in there.
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[LeeFred]

What I'm looking for is just the knobs. I'm being told there are three different length knobs for this. The ones I linked to don't fit the square extensions on the fresh air mechanism and also are too short.