Expanding your list (new items bolded):
Pair a deuces
neither of them was 2042 sheep
43 miles
$24 in a coffee can
40 winks
coming thru on the 24thFour f'in years
2 girls8 months old17 (on the mailbox)
19 (can do what you want)
One's enough (postcard from L.Higgin's shop)
Have we ever analyzed all the mentions of numbers to see if there's some pattern?
And so on. Lot of fours, but otherwise I don't see any obvious pattern. It would be interesting if something emerged, though.
We have talked about the twos, the 8 and the 17. Lots and lots of twos on the short story.
About the 17 (recapitulating from back then): the 17 on the mailbox, 17 letters in Brokeback Mountain, 17 mountain ranges listed by Proulx in the short stoy.
The 8: uh, it's so long ago. They miss August twice, the eighth month. There was more to the eight, but I don't remember right now.
But we never found (searched for?) an overall pattern of all the numbers.
There are definitively a lot of numbers, especially measured by the short length of the story.
And you're right: the four shows up very often.