Thanks. I suspect it is model specific. I have the S-Tec 60, three axis with VS control. I know it is aircraft type specific though that is not to say the same documentation can't apply to multiple aircraft types.
There is actually useful information in the supplements. At least I found this true for the GPS supplement.
S-Tec wants $200 for the supplement. This seems a bit excessive, especially if it is only 20 or so pages of photocopied material which is what my GPS 430w supplement is.
Even if I have the wrong document in the plane I guess it is better than nothing. Maybe the FAA will give me partial credit.
The previous owner had the wrong AFMS for the GPS in my plane for many years.
I'm still concerned if there are other AFMS that I should have in the plane.