DISCLAIMER: Let me just start by saying I'm taking sides nor is this thread meant to be a debate. I'm just posting this to show what I found and what I did.
So I decided it was time to swap the 195 for a 180. Now the question of to drill or not to drill. Taking a look at the one I was replacing determined this for me. The one on the left is the 195 unit. It has a hole already in it. So based on this I decided to go ahead and drill the new one. I used a 1/16 drill bit which is a tad larger than the old one, but I'm not going to split hairs.
You may notice that the old one is offset, this because there is a check ball on the back side. Here a pic for you visual learners.
Sorry for the crappy pics, but they were taken with my phone.
Just let me reiterate that I'm not taking sides on to drill or not to drill. I'm just posting this for informative purposes. If you wish to post and say I shouldn't of drilled it or that it was a waist of time, please go some where else. There are plenty of other threads just for you guys that like to argue.