Replace the bumper and valance with a later plastic version. It's a bolt-on with a little addition of strut braces and such. You didn't ask about the rear bumper, but it's a much bigger job to adapt a plastic bumper to a pre-facelift car.
Quotes to live by:
guessing gets expensive
nothing is more expensive than a cheap BMW
buying a ratty example (of a BMW) is a parasitic relationship.(and you ain't the mosquito)
Ken Kanne, Silverhill, AL, E36 & New Member Intro Forum Mod/Bimmerfest Tow Truck
1995 318is "Bebe"; 1993 325is "Elvira"; 1985 635CSi "Katja"; 1984 633CSi "Sylvia"; 1987 325is "Odette"