If you have added the extra dlc packs using either:

https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2856507260
or

https://www.nexusmods.com/madmax/mods/41 *
* Mod has since been deleted from Nexus

This is just a quick guide to the locations of the hood ornaments from the Road Warrior Pack.

These six other dlc are unlocked automatically and just require buying in the garage.

• The Grizzlegrinda
  
• Sawmeister
  
• Stampeedy Knokshok
  
• Circa Blades
  
• Rockman Brawla
  
• Pentacal Gulpcut

ツ

Jeet's Stronghold.
Walk right from the car, go up the stairs & turn around:

Dead Barrens Pass.
South East of 'The Jaw' is a lighthouse outpost, enter the outpost until you are in the main open area and bear left:

Wasteland Mission Ironclad Faith.
This is the mission to get Gutgash a quality subway car, which also unlocks the 'Fracas Frame Armour Upgrade'.
Dry Gustie, far East storm drain access, linear path through a blockade then a jimmy red cross container & next to where you find the subway car.
*I collected this after having completed the mission.*

Parch Moon Region.
North East from Gutgash is a pile of ship containers, only one red cross container can be opened:

Cadavanaugh Region.
South West of the mountain stronghold is a water outpost, locate the water source:

Chalkies Region.
North West & then East of the secret pass, explore the outpost:

The Heights Region.
The Buzzard tunnels, enter and turn left at the red cross container, enter the on foot section and immediately climb the ladder and follow the path:

O-Ring Diner. (Crowdazzle HQ)
Mortal Bite Deathrun, explore the diner:

Knit Sack Vantage Outpost.
North of 'The Jaw', explore the outpost:

Dump Region Vantage Outpost.
Up the stairs to the main open area & look towards Gas Town:

The Dunes.
Southern roads lead to a station, enter the carriage that hit the car:

Buried Airport. (Buzzard HQ)
Enter the airport and bear left, stop at the sparklies store and go on foot, through the squeeze and it's in the first bathroom on the left:

Thanks to those that have made this dlc available.

If you need more than pictures there are some quick guides here:

FuryGamer

I have no affiliation or contact with the other Steam guide, Nexus mod or the FuryGamer YT channel.