I recently purchased a 6" Aero Ektar for my Anniversary Speed Graphic.
On Ebay, there is a seller based in Italy "inireshop" that makes machined metal lensboards for that particular application.
They also make 3D-printed lens caps, 82mm filter adapters and lens hoods for the AE.
I purchased a lens board, lens cap, and a filter adapter, and I'm happy with them, the machined metal board fit VERY well, the 3D-printed items fit OK, as is typical for many 3D-printed items.
I'm a repeat customer, since I bought a lens cap and filter holder/lens hood for my Hassy 40mm C Distagon in the past.