Cab lights? good luck! I had been looking for 10 years and finally just bought a set for 3.5 times what you would pay for a set of clear cab light lens' for a superduty. If you mean taillights or front turn signals, look on ebay.
I think you can get clear cab lights for a 98-02 dodge and they will fit on our trucks with a little work. I've been told they will cover up the factory holes so they wont leak. Nothing close to a factory look but Im just throwing it out there.