You shouldn't have much trouble finding aftermarket taillights for a 98-01 truck, they have many more available then for the 95-97.
Just FYI, a question like this belongs in the "modified 95-01 Explorers" section. This section is for questions regarding a stock vehicle. The taillights you want aren't stock, so it should be in the modded section. Not trying to be a jerk, but if you put the questions in the right spot, you're most likely to get good responses.