Caroma Vintage installation issues

Caroma Vintage toilet bought secondhand in mint condition but not sure if I have all the parts I need to install. Nonstandard measurements. Bowl outlet is a little larger than 4 inch outside diameter and the floor flange opening is just over 2.5 inches. Tried single wax ring and it just crawls up the outside of the bowl outlet and doesn't appear to seal. The floor flange is 1/4 inch above tiles. Help! Thank-you in advance...

I've never installed this model of Caroma, but it sounds like it uses the caroma offset plastic outlet connector. You should call them to make sure though.