NOTE !!!
If your emergency light doesn't work or they're in the wrong place,this is maybe because they conflict with other mod you install.
Use this mod: https://www.gta5-mods.com/scripts/sirensetting-limit-adjuster

Installation:
1. copy the 'polgrangerrto' folder to the file path "mods/update/x64/dlcpacks/"
2. open OpenIV, navigate to 'dlclist.xml' in "mods/update/update.rpf/common/data/". Add "<Item>dlcpacks:/polgrangerrto/</Item>"
3(optional). if you want black rim, replace those .yft file

Spawn Name: 
fibgrangerrto, umkgrangerrto

Credits:
Rockstar Games - original model,textures and vehicle parts
Ubisoft - original Decussine 2500 model
GCT - original Granger Retro model
Dani02 - converted Granger Retro to V
11John11 & Voit Turyv - emergency light model; trunk equipment
AllenKennedy - edit trunk equipment
Stryfaar - shield texture
Skitty - Wiwang Emergency Lighting System model
AlexanderLB - Wiwang Emergency Lighting System texture, police toughbook case, Toughbook screen texture
SAS994 - headlight & taillight flashers; add 4 side seats