vehicles png icons - top view

For a vehicle tracking app, I need some fresh png icons desgins in different colors for use as markers inside the app.

All icons should be views from top side (not lateral or front sides).
Vehicles list:
- little Car
- standar car
- offroad
- pickup
- van
- truck
- motorcicle

every desing will be delivered in 6 colors: black, white, grey-silver, blue, red, beige/yellow

The deliverable will be:
- different png file for each model+color
- png size 250 x 250
- all vehicles looking at 0º (up)
- size inside png will be different fo each category. Fo example, standar car 200 px, little car 160 px, vans 225 px, trucks 250 px, motrocicle 150 px, etc
- all vehicles centered inside 250 px x 250 px transparent layout
- name files "marker_custom_XX.png", where png is a number from 1 to 42.