Finding the correct clips can be a challenge as they were not specifically called out in all service books. We have compiled a bit of a guide here from our experience to help assist our customers.
Note that this is not an authoritative list, so as always consult your IPC.
Upper Front Covers:
Pn: 35-105110 (LH) and 35-105110-1 (RH).
One each Pn: 258-1 & 258-2 clip required per cover.
Lower Front Covers:
Can be Pn: 35-105005-8 or 000-100100-1 (LH) and 35-105005-8 or 000-100100-2 (RH) depending on aircraft.
One Pn: 258-3 clip for each cover.
Upper Rear Cover:
Pn: 35-105005-12 (LH) and 35-105005-13 (RH).
One each Pn: 258-1 & 258-2 clip required per cover.
Lower Rear Cover:
Pn: 35-105005-14 or 35-105110 (LH) and 35-105005-15 or 35-105110-1 (RH).
One each Pn: 258-3 clip for each cover.