This issue became messy for me too – the first dealer I went to had trouble and gave me some part #’*. When I went back to order from another dealer, part #’* were different so I had to pay more attention to what they were looking up.
GM parts computer has them described as Positions 1, 2, & 3. “Position 1” refers to the 2 front ones and “Position 3” refers to the 2 rear ones. Each position is coded with a different color paint stripe (I guess to make it easier for them not to get them mixed up on assembly line.)
The thing that confuses people is that in some places they list the same part number with two different colors.
In my case for the lower bushings, Position 2 is listed as “14103535 Yellow” and Position 1 is listed as “14103535 Orange” (IIRC).
It is the same part for both positions – you just have to choose what color paint stripe you want.