I've been looking for the same thing on a 94 Subaru legacy wagon. There is a rear lens for your 95 subaru legacy wagon selling on eBay right now...
Remove the 2 screws that hold the plastic lens, pull out burned bulb, push in new one (#168 or #194), verify if working, reinstall lens.....
The headlights are sealed units, unfortunately they do cloud over a bit with age. Try a cut and polish on the outside of the lens to clean them up a bit, but you would have to go to a plastic welder or similar to get them to remove the housing, and even then, cleaning them may not remove the cloudy effect.
how to replace the headlight
Unscrew the lens, replace the bulb, and put the lens back on.
If you mean the 3rd brake light, it has a couple of screws to be removed to get the cover off allowing access to the bulb. If you're talking about the multifunction (brake/signal/parking) lights, it's similar. You'll have to remove the whole lens assembly. Be careful with it, cause you don't want to damage that lens assembly, they're ridiculously expensive to replace.
You should be able to purchase a CCTV security lens where your friend purchased the security camera. Supposedly it is relatively easy to replace by the camera lens yourself.
I assume you mean HEADLIGHT LENS.. .. there are 3 bolts on the back, remove, pull out headlight. Remove clips and broken lens. Replace gasket, lens and put on clips FRONT TO BACK so you don't chip the lens. Reinstall with 3 bolts on back.
If you are speaking about replacing the bulb - just inside the tailgate, on either side there are little "doors" set into the decorating panel. Open them to gain access to the rear of the lens housing so that you can remove the bulb from the rear of the housing to replace it.
eBay has plenty. two screws holding lens in.
Remove the dome light lens, pull the old bulb out, and replace with new bulb; replace the lens.
You must replace entire assembly. If your problem is just foggy lenses, you can get lens cleaning solution at auto parts store.
See *License Plate Light* on page 11-58 of your "Owner's Manual", under Section 11: Maintenance and Service - Replacing Bulbs. (If it's a wagon, make sure you don't lose the 2 little plastic spacers when you remove the lens.).....