I have a set of nice gaffrig throttles and shifters that are two separate units 2 throttles 2 shifters. my Question is can I buy a section from gaffrig and bolt them into one unit for my current project. or am I stuck with how they are

I have the mercruiser zero effort. I know they were sold by others but not sure if they are same as you have. I order pieces and they were cheap. Matter of fact, I have extras now if it turns out they are the same.

That probably depends on if they are still making that model.
BTW, the Gaffrig controls you have are most likely actually Livorsi.
There used to be 2 Gaffrig companies and one had to change its name to Livorsi.

Great question i have the same set and was wondering the same thing also noticed the gafferig and livorsi had same part # ,will have them on bench today but it looked like they could be combined depending on the orientation of the end piece that contained the threads that hold the 5 long screws that hold it all together

I think with the addition of another middle part and lose the ends on each set it would work now to find the part!