@HumBurner
Here are some of the orange 266 top cover part numbers before they switched to the one piece ignition and moved the top left mounting screw on the top cover. If I can't find this 266 with the earlier screw mount position, I might have to look into drilling and taping the case for the slightly different top left mount screw that is on the later saws and the 268 and 272 saws. I would prefer the early two piece style ignition top cover mounting, but I included the later orange tops with the one piece style mounting hole position. Just an fyi to help you know what you have.
266 top cover - 501 68 60-01
266 top cover - 501 68 60-63
266 top cover - 501 68 60-08
Here are the part numbers for the later orange top covers with the one piece ignition style mounting. These are the
268 top cover - 503 40 60-02
268 top cover - 503 40 60-01
268 top cover - 503 57 95-02
272 top cover - same as the 268 numbers
Late 61 orange top cover - 501 68 60-07
Late 61 orange top cover - 501 68 60-04
Late 61 orange top cover - 503 61 00-03
Thanks! I am excited to hear back from you!
Rm Blake