How to remove certain number of items from a vehicle / crate?

[Undeceived 392]

This might be a stupid question, but I somehow can't find a solution for it! :D

I have a vehicle in which I have put some weapons and stuff. Now I want to remove a certain number of FirstAidKits from this vehicle (10).

But... There's no removeItemCargo command. There only is clearItemCargo, which remove ALL items. But I want other items (scopes, etc.) to stay in the vehicle. I only want to get rid of 10 damn FirstAidKits. :D

Any idea? :o

Thanks for your patience and time! :)

[dreadedentity 278]

Clear the vehicle's cargo before you add stuff to it.

[jshock 512]

Here is this line, not sure if it works within vehicles:

this removeItems "FirstAidKit";

Should it work, it should remove any items that have the classname of "FirstAidKit".