With OpenIV:

I. Copy the three Vigero files to mods\x64e.rpf\levels\gta5\vehicles.rpf\
  
II. Copy vehicles.meta and place in mods\update\update.rpf\common\data\levels\gta5\  -OR-  copy lines in the vehicles.meta folder's text document and overwrite the VIGERO entry in the .meta file.

III. Copy carvariations.meta and place in mods\update\x64\dlcpacks\mpchristmas2\dlc.rpf\common\data  -OR-  copy lines in the carvariations.meta folder's text document and paste in the .meta file.

IV. Optionally, copy lines in handling text document and overwrite BUCCANEE entry in handling.dat found in mods\update\update.rpf\common\data.



