Help!!!!

I am in desperate need of the little clip that holds the brake bedal to the booster, under the dash. I cannot find one anywhere and the car cannot be driven without it. I have an 87 Plymoth Acclaim.

Call up some local wrecking yards and see if they have an Acclaim in stock. Likely any year of Acclaim will use the same clip. It's possible other '80's Chrysler front wheel drive cars have the same clip, such as the Sundance, Shadow, Caravelle, 600, LeBaron and the K-cars (Reliant and Aries)

Your best bet is a yard where you can pull the part yourself. It will be cheaper.

Otherwise, check the local classified ads. There may be someone parting - out one of these cars, so you could get the part there.

BTW one possible reason for your inability to find the part is that there was no such thing as a 1987 Plymouth Acclaim.
The Acclaim was made from 1989 to 1995. Asking for parts for a 1987 Acclaim might cause some confusion from people who supply or sell parts.