Greg,
Your blue diamond box is great, but the one you included is for the small or mini engines 13mm in size (4 to a pack). The 18mm and 24mm engines came in diamond packs long enough for 3 engines. I say this because the writing on the one you include has 18mm engine designations, not 13mm.
Do you have a diamond pack recreation for the larger engines? The 24mm size is larger than the 18mm size. I'd like to print some...
Allen