Hey mikoloe - taking a shot in the dark here since I'm not sure if you frequent this site still but I see your name a bunch throughout the forum with respect to side mount plates.
I'm going with the horizontal mount from Road 6 customs and I want to slot it to avoid removing the axle completely. Since I am going to slot it, what mounting hole size do you think I should I use? 3/4', 1" or 25mm?
Thanks for your help