They are there inboard of each vertically positioned spider gear, I can see it in your JPG (at least the right side one) rotate the axle around, you'll see each one.

(I wouln't describe the C-clip as a BIG c-clip, more like a quarter?) Look at the end of your new axles, they slip around that ridge.

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84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)