If it hadn’t been for / had it not been for + modal

C2 point 91 in the category of PAST in the English Grammar Profile is defined:

fixed expressions: if it hadn’t been for / had it not been for + modal

which collocates with:

If it hadn’t been for + up to 9 spaces to the right in the COCA corpus (I changed to this corpus because iWeb and NOW corpora were not allowing or providing much information):

1 WOULD 101

2 NEVER 23
3 MIGHT 18
4 PROBABLY 8
(the same search with “had it not been for” did not locate modals and the collocate frequency was much lower overall)

Up to 4 spaces to the right of “had it not been for
From the NOW corpus:
(without the modal verb as required by point 91)

heroic, defensive, intervention, interventions, persistence, resistance, swift