Deardorff adapter lens board for Linhof format

Recently, I was able to obtain a Deardorff 8x10 camera, and I am now looking for its lens. Since I have a Tachihara 4x5 which accepts Linhof lens board, I want to use one of the lens for Tachihara (Nikkor M300) for Deardorff in common. I would appreciate it if someone can inform me where I can get the adapter lens bo ard for Deardorff so that I can mount all the subsequent 8x10 lens on Linhof boa rd to make them common between 4x5 and 8x10.