husqvarna rear end help

I have a rear end out of a husqvarna hydrostatic rearend that I need help with. I used to work in a small engine shop so I know my way around a mower but I made a mistake while working on this rearend. The hydro gear model number is 310-0510, if you pull up the parts diagram what I need help with is item number 3. It has two ports (Part 23&75) apparently there is a difference in the ports. One of them is marked with a dot and the other one isn't, I forgot to remember there orientation when I disassembled it. If someone could tell me which one is which I would greatly appreciate it cause I don't wanna put this thing back together and it not work or worse really mess up the transaxle.