Where to buy. 1982 400ai. Afraid of some vendors
For the suspension? I'm a big fan of the poly non-oem options and sourced everything through Ferrari Service of Bedford, NH. Pressing the stock bushings in & out requires a lot of metric pieces (easy if you have a lathe at hand) and a big-ass press.
For suspension ? In that case Superformance have what you need if you're thinking about OE-quality parts. They stock high quality stainless and brass bushings for our cars. Have a look They are nothing to be afraid of. Fast shipping and good communication.