The piece on top of the grill shell (sometimes called a doghouse) would be the upper baffle. I see them fairly regularly on ebay. The upper baffle for a PU is different from that of a car. On a car the hood props are at the firewall end of the hood. I've not seen a truck set up but I always assumed they were similar.
This shows the upper baffle on my 38 coupe.

I don't have a good pic of just the hood props but the very upper right of this pic shows the prop mount location on my coupe.

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