Replace OL Illustrious 3 with Graham 2.2?

I don't know the Illustrious but the Graham 2.2 is a great arm. I've had one mounted on an Orbe SE for several years and think it's a great combo. All of the necessary adjustment parameters are at your finger tips with the 2.2. It's a fully realized, mature design with a wonderfully open, balanced sound: excellent high frequency resolution, a full, natural midrange, and a solid bottom end if you take the time to get the damping right. Combine it with a quality phono cable like an IC-70 and it's hard to beat. Despite all the hype about the Phantom (which I also own, mounted on another deck, and think is terrific), the 2.2 remains a classic. Plus, you can buy them at absurdly low prices right now.

The 2.2 is a better tonearm than the Origin Live. At its' present pre-owned price a bargain IMO. For the money, an inexpensive way to upgrade your front end. If by chance it doesn't work out, you'll lose nothing except some time.

I have no financial interest in either line.

Is the removable arm wand made for the use of different carts by switching out the arm with pre mounted cart? Also, what is the size of the mounting hole? Im not sure if arm mounts are available for my TT anymore. I could make one but I don't need the hassle now.

Yes on the wands. 1.5-in. hole, pivot-to-spindle 217.4 mm (roughly 8.5 in.). It's actually an extremely easy arm to mount because Graham includes a little nipple that fits over the spindle; then you fit a specified hole in the headshell onto the nipple and that's your p-to-s distance. Very easy. It's a well thought-out bit of engineering.