re: metalhed
some companies do sell the lower and side parts seperately, as a metter of fact APC even makes some of teh lower ones but if you go to pacificie.com you can get the set of them for 64.
re:face
i am starting to have the same problem with headlamps and tail lamps..you could try to take them out, let them dry out, re-sel the edges and get a new bulb gasket or just buy a new set. i plan on just buying new ones that way if one breaks, i will have another. you can get a set for about 100 wihich includes the brackets.