If it were mine I'd force them to put OEM back on. OEM parts were damaged, OEM should be used to replace them.
The bad part is he’s already at 50% of value using aftermarket parts. So if he really wants this truck repaired I don’t think I’d push them on OEM parts.
Yall ever seen the price difference between OEM and aftermarket? On some things its a crazy difference! And often everything appears to be the same quality and material but missing just one little thing...a peterbilt emblem stamped into it...
I've had mixed experience with aftermarket. Even Caterpillar's own aftermarket brand (Yellowmark) is really hit or miss.