1.Download this Pack And after install follow the steps : https://www.gta5-mods.com/vehicles/emergency-declasse-alamo-2600ls-add-on-sgt_jhonny

2.copy the files into Jhonnyalamo (data and x64)

3.Drag and drop in this address : Grand Theft Auto V\mods\update\x64\dlcpacks\Jhonnyalamo\dlc.rpf
And done

See you again. 