I was just going through this a few years ago while rebuilding my 1970 AM/FM 8tk.
Stay away from HEATER CONTROL LENS spring clips,as they are similar but not the same & won't fit..>
https://www.npdlink.com/product/spri...3-repro/198984
Here's the 4 clips I searched high & low for back then at a few local swaps.
The ones first on the bottom of this pic with the unique squared end bend are for the top of the radio lens.
The Back clips in the pic are for the bottom of the lens.