Welcome to the forum, glad you joined us.
As far as the CDI...not sure what the Old Trac is, I am not familiar with it. If I have time I will look more into it and maybe then I can tell you if it will work or not.
For the wheel, I got mine at bicycles, tricycles, industrial bicycles, industrial tricycles, bicycle parts, tricycle parts
I have been very happy with it. A few members have also purchased wheels from them and as far as I know they have had no problems.