Hi Carson ,yes you are correct that the first one is the fuel pump and the second is for the a/c, but those are not for the 86 560SL.
I looked it up on AllData and they are saying that the fuel pump relay is a smaller relay and this one is silver.
You are correct that that is the normal relay for the 126 and 124.
But I think the 107 has a different relay.
I wish I could post the pix from AllData so you could see