What year or chassis is the 525? If it is an e34 (1989-1996) the lenses cannot be easily replaced and involves using a heat gun or to remove old lenses and gluing new ones on. The whole assembly can be replaced but it is not cheap.
how to replace the headlight
replace the light module
If you're talking about the headlight, the "lens cover" is not a separate part, you need to replace the whole headlight assembly.
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.
There aren't headlight covers, it all one unit. One of my lens was cracked and I had to replace the whole unit.
Where the lens meets the housing there is a seal, just replace it.
You don't. Instead, you replace the entire assembly.
You must replace entire assembly. If your problem is just foggy lenses, you can get lens cleaning solution at auto parts store.
The lens itself is part of the composite headlight assembly. It all has to be replaced as a unit.
If a plastic lens, drill a very small hole at the bottom to let water drain out. If a glass lens, you will have to replace.
To change a Honda 300 Fourtrax headlight, first unscrew the lens and remove it, twist the bulb out of the socket, insert a new bulb and then replace the lens.
Take a hammer. smash the headlight assy. lens. Remove old bulb, put in new.