New to pegging!

Hi everyone!

My boyfriend and I have just started to experiment with anal play, and will soon be investing in our first pegging harness. We were considering getting the beginners Love Honey harness that comes with a small dildo, and by reason te reviews, is great for beginners. The harness comes with 3 O rings, sizes 1.25, 1.5 and 2. I already have a slightly larger dildo that we were hoping to work up to, but it has an O ring diameter of 1.75. Is this something that I can just buy a different sized O ring? Or would I have to purchase a new harness?

Thanks in advance!

We`ve got this one..

Fun Factory ShareVibe USB Rechargeable Vibrating Double Strap On

...great fun for both of you...and easy to take off and on...x