$300 XJ750, what parts fit from 82 to 83?

I see a 82 XJ750 for sale with front end damage. I have a 83. I know the handle bars and turn signals are square on the 82 and round on the 83.

I see it has a nice seat and backrest I'd like to put on mine. Plus I'd have extra stuff like side panels and stuff like that. Not to mention an extra motor and other stuff.

What else will fit and what doesn't fit from 82 to 83.

Here is the link to the bike;

Crigslist

 

Except for the handle bars, instrument pod, head light and turn signals, they are identical and I believe all the parts are interchangeable. The 83 did not have a gas gauge though.