With aftermarket tail lights, the fitment will be poor. (Or with my experience they are).

Stock tail lights are quite expensive.

Buy yourself a set of LED Tail lights off ebay for roughly $160 - $180 and get them to fit, shouldnt take much "modifying" if at all.

If they do leak, remove them, bake them to get water out, re-seal them and install OR just tint them and call it a day.

Not only do they look good, but its an upgrade for safety also, the LEDs are much brighter than stock lights.