FCP Groton has a kit but they say it's for 1981 cars and up. You could call their toll free number (ask for Nick) or send an e mail (direct it to the attention of Nick) and inquire. If they don't have stuff they can usually get it and still for less than most others.

If the '78 is the same basic set up as the later cars, and I believe it is, you need front trailing arm bushings (one for each side), rear trailing arm bushings (one for each side), four torque rod bushings (two for each side and they're all the same) and one right and one left track rod bushings (slightly different from one another and don't interchange). But the actual bushings themselves for your car will be a little different from the later cars so make sure you get the right ones for your year.

Ask by whom the bushings are manufactured. The general consensus on bushings made by Scan Tech is that they are of inferior quality. I would avoid buying them.
--
'80 DL 2 dr