[Grammar] Preposition ‘for ‘vs ‘to’

[northpath]

Will it be a mistake if I say
The company supplies paper for the printers.
We supply spare parts for the cars.
Instead of
The company supplies paper to the printers
We supply spare parts to the cars.
?

 

[Rover_KE]

Only #4 is wrong (if you had numbered them).

 

[Raymott]

I'd leave out "the" in all four sentences, unless there are some predefined cars and printers you are talking about. But I think you mean cars and printers in general.
"We supply spare parts for cars."

 

[GoesStation]

#3 works only if printers means "printing company", which is possible.