I am having my interior redone. I need to find some placards that are painted on the side panels, and would like new ones for door panels.
Beech is your vendor of choice. A quick look at the Type Certificate Data
Sheet will show you what they are supposed to say, and will show you if you can replace them with generic ones you supply, or if they must be from Beech.
The difference is this. If the TCDS says: “Spins Prohibited”, or whether it says: “Beech P/N 169-xxxxxxx-1” (usually accompanied by a crude picture of the placard for identification purposes). The former allows you to supply your own, the latter requires the Beech part, or FAA approval of your version to replace the Beech part.