Advise on bike fit/size FELT

Hi. I am a 178cm, 83.5cm inseam.

I was wondering but cant find a concrete answer online.

Looking to get a Felt Ar advanced 105, being told by online seller to get 54cm but when I look for felt chart size online I see myself in 56cm.

Can anyone with felt advise or this bike share their opinion? I would really appreciate it as it is my first proper good road bike.