the face indices sector starting at ab6b was split into two parts - those parts are using the offset vertices starts + using a different fvf size
first one is the underbody backfacing stuff
0xAB6B 1539
12 99
0xFC9 855
+++++++++++
0xB771 898
36 99
0x4A991 726
second one is the doorseam mesh
https://imgur.com/a/2myeQpq
yet i cant tell if the mapping is right - but for me the meshes are enough

maybe someone is able to update blackracers script for noesis to make this a bit easier