At a minimum you will need:
T-ring/adaptor:
https://www.bintelshop.com.au/Product.aspx?ID=5551
And then something to attach to the T-ring to slide in to the draw-tube of the telescope, like this:
https://www.bintelshop.com.au/Product.aspx?ID=7182
Depending on your refractor you might need something more like extra spacer or the like, but there's a very good chance the above two would be sufficient.
EDIT: Check your refractor didn't come with either of the above. My Megrez came with an adapter equivalent to the second item above.
Roger.