Finish Trims are available and standard from professional millwork supply houses that supply pocket door rough frames. This is where a professional sales person can lead you through a quality selection process. I believe your “supply contact” needs for you to move up the scale of service & knowledge to a professional supplier.
Two places near Fenton, MO, provide just the materials and knowledge. One is Premier Building Supply 636-394-6055 and another is Tree Court Builders Supply 636-225-7717. Both can provide to you and describe the trims common on a pocket door. You will need to decide the casing profile best for your project. The pocket door hardware & rough frame installation instructions describe this following process, please read the instructions.
After the pocket frame is installed plumb and square and the door is hung on the hardware, prior to drywall installation, the door is placed in the closed position. The rough door opening will be wider than the door. There are two 1/2″ x 1-1/2″ x 7′-0″ (tall) jamb strips needed for the edges of the wall cavity jamb side of the door. There is also the need of two top pieces of the same material which usually is supplied with a third 7′-0″ piece which gets cut in half, to length for these two head jamb pieces.
Next is the vertical wall jamb where the latch set keeper will attach, the part that the door butts into when closed. This is traditionally a 4-9/16″ x 3/4″ x 7′-0″ typical jamb liner wood piece which gets shimmed to the proper position by closing the pocket door and noting where this jamb needs to be located in order that the door opening is slightly smaller than the actual door width, usually about 1/2″. Install this jamb liner plumb … and case trim the opening with your choice of trim. The base trim then butts into the side of the door casing at the floor.
Choices in millwork are for clear wood or primed. It is important that you know whether you will paint or stain these trims. Clear millwork is for stained finish and is solid wood. Paint grade quality is usually finger jointed material from many pieces put together with a primer paint already applied. Clear is higher quality and more costly, paint grade is finger jointed and primed and less costly than clear.