Finding the many details ready made can be quite a task and you may end up making them yourself. Mine was the inspection rings needed for the scale features on a 1/4 scale Super Cub, most of them are on the bottom of the wings, there are other inspection ports that are a window also easy to do with clear plastics.

I found the close to right size PVC tube, it's 1 and 1/2", cut a 8" piece and cleaned up the saw kerf marks on a belt sander. I put a thin metal cutting blade on the band saw and set up a guide and cut a ring off, It was .030" thick so adjusted it for rings .023 thick and proceeded to cut both ends of the tube then hit the end of the tube with the belt sander and cut two more and so on until I had 30 of them They were cleaned up with a the edge of a #7 blade and came out real nice. Finished size is 1 and 7/8" wide, .023" thick and about 3/16" cross section. There are a lot of details on this plane and I will have to get creative to make them all, it only goes to show that we can make a lot of this stuff.

One picture shows where some of the rings go on the wing bottoms, the fuselage has some also.

Leroy